I just got a HTC HD2. Nice piece of hardware when one is used to this wonder of a phone Nokia 1208:
But I ran into some problems or lets just call them limitations.
1. The wireless
I needed it to logon to a wireless network using WPA-Enterprise, TKIP & PEAP. It kept saying that my certificate was not valid … and it was right, but there were no ways of turning this off. Then I searched google and found this.
You need to edit this registry key and then it works:
\HKLM\Comm\EAP\Extension\25\ValidateServerCert=dword:00000000
2. The start page
The start page is limited to 3 icons per line and that's awful, what the hell were they thinking when making this. But after installing a little program I get 5 icons per line.
There are links to the cab files for 3, 4, 5 and 6 icons per line. The files names should be self explaining.

3. Home page
The Home tab is ARGHH and crappy, this little cab file will do wonders with it and you can edit it, dran’n’drop icons … you will love it. I know i do.
Download HomeTab 1.7.1 - Home
Download CHTEditor - Home
Video of Co0kie's Home Tab Mod 1.7 for HTC Sense 2.5
Its required to signup to download but its worth the time.
4. Shake And Save
It's a print screen program for windows mobile. Used to make this blog post.
Download ShakeAndSave
Tips
1. keyboard
Just like the iPhone, if you double tap the space bar on the keyboard after a letter, you will enter a period (full stop) AND a space automatically.
2. Regdb Editor and other utilities
Resco explorer and lots of other great stuff. Try it out, its real nice.