Htc hd2 hints 37 : Unlock Additional Video Recording Formats

Go to HKLM\Software\HTC\Camera\P2 with Resco Registry Editor and replace the EncodeFormat value with 2147483647
This will unlock all modes/resolutions listed below:
H263(3gp): CIF 352x288 \ M 176x144
MPEG4: L 320x240 \ CIF 352x288 \ VGA 640x480
3GPP2: S 128x96 \ M 176x144 \ L 320x240 \ CIF 352x288 \ VGA 640x480
MOTION JPEG: S 128x96 \ M 176x144 \ L 320x240 \ CIF 352x288 \ VGA 640x480
H264: L 320x240 \ CIF 352x288

Htc hd2 hints 36 : Improve Camera Recording Quality of MPEG4-VGA Videos

The following tweak will increase the video quality from 2100avg bit-rate to 4500avg bit-rate.
Go to [HKLM\Software\HTC\Camera\recparam\MP4VGA with Resco Registry Editor and replace the BitRate value with 4194304 (default value = 2097152)

Htc hd2 hints 35 : SMS Messages Speed Loading

If you have a lot of messages in your inbox it takes forever to load, but if you tap one of the messages when they show up (so that a menu pops up) and then tap the close right soft key, all the messages are loaded. Also you can tap the Send icon button and then the No button to do the same thing.