Open PDFs in Adobe Reader So They Automatically Fit to PageBy default, when you open up a pdf in Adobe Reader, they are  automatically opened at 75% zoomed in so you have to pinch to zoom out  to see it fully. Now you can have it automatically display at 'fit pdf  width to screen width' to see the entire first page.
HKCU\Software\Adobe\AdobeReaderLE.25\InitialZoomTy  pe  change to 
1.
Change Haptic Feedback in HTC CalculatorTurn off haptic feedback by using this tweak: 
HKLM/Software/HTC/Calculator/Vibrate change to 
0Change the strength of Haptic Feedback by going here: 
HKLM/Software/HTC/Calculator/VibrateLevel change to 
0 for no feedback or 
6 for high level of feedback. You can choose between 0 to 6.
Make Common Apps Open Instantly With No DelayThe most often used apps on the HD2 would be SMS and Email. As the HD2  has plenty of memory and it is very hard to fill it up during use, why  not add these two apps to the task manager exception list. This means  they will never truely exit and will always be open in the background.  The benefit of this is that HTC Messaging does not automatically refresh  and redraw the contact thumbnails when you load the app. Instant  opening of both apps with no load time. You can add any other app to  this list too if you never want it to exit.
Just use this tweak. 
HKCU\Software\HTC\TaskManager\ExclusiveList\System and add a new DWORD Value of 
Messaging_Client.exe and 
tmail.exe
Enable Landscape View for YouTube and Streaming Media AppsThe benefit for enabling landscape view for Youtube is you can see  truncated video titles in full length. Just make the following reg  tweaks to enable both apps:
HKLM\Software\HTC\YouTube\EnableRotate change to 
1HKLM\Software\HTC\StreamingDShow\EnableRotateScree  n change to 
1Then add Youtube and Streaming Media apps to the gsensor whitelist registry using 
BsBTweaks. You shake your phone and BSB adds the active app to the registry. You must reset to see changes.
Increase the Number of Allowed Recipients in Group SMSThe max number of defualt contacts to send a group SMS is 10. You can change it to 50 by using this tweak:
HKLM\Software\Jataayu\Messaging\MaxRecipientsChange from 
10 to 
50Change Google Search Language and Country of Origin in Internet TabSome users experience a German version of Google Search when using the  search feature direct from the Internet tab. Now you can modify it to  your country.
Go to 
HKCU\Software\HTC\Manila\ and create a new String Value.
Name = 
Internet.SearchUrlString = 
google.co.uk/pda/search?hl=en-GB&output=html&q=%s (without "http://www.")
You can put any search engine here. "Pda" is included in the above  String to optimize it for your phone. If you want the html search  version view then just delete the "pda/" part. Also instead of "en-GB"  you can put your own country code such as "en-US", "it", "fr", "de" etc  to change the language of the Google Search interface. You can also  change the ".co.uk" to your own Google page for your country by using  ".it" or ".fr" or ".com" or ".de" etc.
Change Text in Google Search Field in Internet TabYou can edit what it says in the search box  on the internet tab (default is "Google Search").
Go to 
HKCU\Software\HTC\Manila\ and create a new String Value.
Name = 
Internet.SearchTitleValue = 
Tap here to search Google (or any other wording you like).
Speed Up Music Album Loading on RebootAfter a reboot and you scroll to Music Tab, you have to wait quite a  while for all the music files to be loaded. Now you can speed this up by  making it load as soon as the phone starts and before reaching the tab.  Go to your Windows folder and find the file "AudioManager_Eng.exe"  Create a shortcut (.lnk file) of this file and put it in your  Windows\StartUp folder.
Organise All Your Icons into Category Folders in Start MenuUsing a File Explorer, add new folders to your 'Windows\Start  Menu\Programs' folder. Name them like: Web, Travel, Utilities, System,  Audio, Video, Imaging, Fun etc. Move the relevant shortcuts from you  'Start Menu\Programs' folder to your category folders. You will need to  use a 3rd party file explorer to unhide system files and rom files to  see the pre-installed icons to move them to your folders. These  icons/shortcuts are '.lnk' files. Remember each time you install or  remove an app, you have to either move the new 'lnk' icon to your  category folder or delete it.
Set a Music File as a RingtoneUsing File Explorer, you can tap and hold on an mp3 file and choose "Set  As Ringtone". Also, just copy any MP3 file to "\Storage Card\My  Documents" folder and all of the mp3 files copied to that folder will  show in list as ringtone and SMS tone.
Faster Keyboard Responsivness when TypingHKCU\ControlPanel\KeybdChange 
InitialDelay from 
375 to 
100Receive Bluetooth Files Without Entering a PasskeyBy default when a device which is not on your paired devices list is  going to send you a file by BT OBEX Push, the BT manager requires a  passkey. You can't disable this in the normal control panel but you can  in the registry.
Go to 
HKLM\Software\WIDCOMM\BTConfig\Services\0002Change 
Encryption from 
1 to 
0 (to not use a passkey)
Change 
Authorization from 
1 to 
0 (to receive all files without asking)
Enable More Future Events in People Facebook TabBy default you can only see Facebook events within 30 days but you can make it show events which are 60 or even 90 days away.
Go to 
HKCU\Software\HTC\Manila\Facebook.LeadTimeOfEvents and change 
30 to 
60, or 
90 or any other amount of days.
Instant Tap and Hold in EmailWhen viewing your list of emails, instead of tapping and holding an  email and waiting 2 seconds for a pop up menu to appear, you can get the  same menu to appear 
instantly by tapping the envelope icon to the left of the screen.
Show HTC Shortcut Icons in Start MenuYou can have shortcuts in your Start Menu to Peep (Twitter), People,  Music, HTC Calendar, HTC Reader by using the following tweak:
Go to 
HKCU\Software\HTC\Manila\IsShortcutEnable and change from 
0 to 
1.
Use Outlook Contact Photo Instead of Facebook PhotoOnce you sync to Facebook, in HTC People all your Outlook contact photos  change to Facebook profile photos. To swap them back, just seltect a  contact and then Edit Contact and tap on the photo to swap it.
Save Camera Photos Direct to Storage CardFor new owners out there, open the camera app, then go to the settings  and in the Menu, tap the Storage box so it shows a memory card icon.
Files You Should Back up Before a Hard Reset for Trouble Quicker RestorationAfter a hard reset, it is a pain to have to restore your custom settings  etc. Here are my recommended files to back up. Some files and folders  can just be copied to a backup folder on your Storage Card, while  registry entries will need to be exported to your backup folder. To  restore after a hard reset just overwrite the orginal file.
Windows\Favorites (Web Browser favorites)
Windows\ET9IMEDB folder (T9 custom dictionary and added words)
Windows\YouTube folder (Saved Channels, Favorites, History and Search)
HKEY_CURRENT_USER\Software\HTC\People\FavoriteOrde  r - a Registry Key Folder (The order of your favourites in People Tab)
Most importantly, use the free PIM Backup app to save your Contacts,  Emails, SMS, Tasks, Call Logs, Speed Dials and Calendar entries (free  download at 
http://www.dotfred.net).
Shortcut to Comm ManagerInstead of scrolling to Settings tab and tapping on Wireless Controls,  you can also access the Comm Manager by tapping the top task bar to get  the Notifications screen and then taping on the phone reception icon.  The beauty of this method is you don't need to be seeing the touchflo  tabs and can get to Comm Manager while in any other app showing the top  task bar.
Enable Align Screen Calibration in SettingsCertain US roms or custom roms do not have the screen calibration option  showing in All Settings, System, Screen. This allows you to tap on  crosshairs to calibrate the screen. To enable it just use the registry  tweak below:
HKLM\ControlPanel\Pen and change from 
1 to
 0.
Enable All Settings Shortcut in Start MenuMost roms have the Settings shortcut in Start Menu link to the Manila  Settings tab. To gain access to the Windows Mobile  settings you have to  go to the Manila Settings tab, hit Menu and then hit All Settings. The  following tweak adds a new shortcut to the All Settings page. Soft reset  required.
HKLM\Security\Shell\StartInfo\HideSettings and change 
1 to 
0.
ReEnable Facebook Album ThumbnailsAfter many tweaks you may have realised you can no longer download your  friend's Facebook albums in the Album tab. Go to the following registry  and make sure the cachesize is set to 0 and then reboot: 
HKLM\SYSTEM\STORAGEMANAGER\FATFS\CacheSize set to 
0.
Enable Sent SMS Status NotificationsBy default, you have no confirmation if an SMS has been sent or not. Now  you can enable a pop up message to tell you if an SMS has been  successfully sent and even if it has failed. Go to All Settings, Sounds  & Notifications, Notifications tab, tap on Event and choose Message:  Send failed and check Display message on screen. Next choose Message:  Send succeeded and check Display message on screen. Finally you must  also make the following reg tweak:
HKLM\Software\Jataayu\Messaging\DisableSMSSucess change from 
1 to 
0. This tweak works on specific roms alas.
Quick Manual Update on Twitter Tab Normally to manually update the Twitter tab, you have to tap on Menu and  then Update Now. You can save one tap by just tapping on the sync icon -  right above your top listed tweet on the Twitter tab. Also works with  weather tab.
Solution to Trouble Signing into Twitter Using HTC PeepTo avoid a login error with the HTC Peep Twitter client, make sure you've signed out of Twitter in the browser of your computer.
Choose What is Shown in the Thumbnail for Favourite ShortcutsThe first time when you add a favourite shortcut to the Internet Tab, a  screenshot is captured of the website and saved to your shortcut. The  screen capture is of the top left corner of the website as soon as it is  finished loading. To get a closer/zoomed in screen shot of maybe the  title logo of the website, double tap to zoom in and drag so the top  left corner shows what you want it to show and wait. You should do this  WHILE the page is still loading and before it finishes. Again, this only  works when adding a shortcut for the first time.
Activate Camera Flash Even On Low BatteryDy default you cannot use the camera flash when the batter level is very  low. Use the following reg tweak to allow you to use the camera flash  even when battery is low:
HKLM\Drivers\BuiltIn\Battery\FlashLightPowerUnavai  lable and change from 
1 to 
0.
Disable Keyboard VibrationSome people find the vibration when typing a message to be a  distraction. You can disable haptic feedback everytime you press a key  by going here:
HKLM\Software\HTC\ezsip\VibrationEnabled and change 
1 to 
0.
Enable Onscreen Menu When Camera LaunchedOnce you have launched the camera app, if you want to zoom in or change  the capture mode or access the settings menu, you have to press the menu  icon in the lower right corner. Now you can have the on screen menu  automatically show for 6 seconds once you have launched the camera -  thus saving you a screen tap and time. Use this tweak: 
HKLM\Software\HTC\Camera\General\ShowUIAfterLaunch  Camera and change 
0 to 
1.
Enable Clearer In Call RecordingWhen recording phone calls via the Menu, Record option during an active  call, the clarity might not be that good. Add the following tweak to  make the recordings of both parties clearer. Phone call recordings are  saved to your Notes app. Go to 
HKLM\Drivers\BuiltIn\WaveDev and add a new DWord  Value. Name: 
MixModeRecord and DWord: 
1. If Record does not show up in the menu during an ACTIVE call, use the following tweak: 
HKLM\Software\Microsoft\Voice. Change 
AllowInCallRecording and 
EnableCallRecordMenuItem from 
0 to 
1.
Enable Speedier Entries When Setting TimesIf you have your clock set to 24hour format, when entering times in a  new appointment or setting a new alarm you have to scroll through 24  numbers to choose the right hour. By going to Settings Tab, Date &  Time and unchecking 24-hour format, you now only have to scroll through  12 digits when selecting an hour - thus quicker to execute.
Change Landscape Angle for Better Bedtime ViewingIf you browse the web or send emails while laying down (say in bed) it  can be very frustrating that your phone switches to lanscape when you  want it to stay in portrait mode. Execute the following reg tweak so  that the phone will only rotate to landscape if it is tilted over 60  degrees as opposed to 35 degrees. 
HKLM\Software\HTC\HTCSensor\GSensor\LandscapeAngle  Threshold and change from 
35 to 
60.
Hidden Links on Home TabPut your Weather and Calendar tabs towards the end of the other tabs as  you can easily access those tabs by pressing the weather graphic under  the flip clock and by tapping on the date - all on the Home tab. Also  you can access the World Clock by tapping on the flip clock and you can  access the Alarm Clock page by tapping on the Alarm text - again all on  the Home Tab.
Instantly Convert Web Youtube Videos into Mobile Viewable Videos in BrowserSometimes when clicking on a link to a Youtube video it will take you to  the Desktop version of the video and of course our phones do not  support Flash videos in Opera. Simply delete the 'www' in the video url  and replace it with the letter 'm' and reload. It will now show the  mobile version of that page and allow you to play the video with your  built in HTC Youtube Player.