[iPAQ rw6828, XDA Atom ROM Development] malloth:
Sure buddy. Those are the one I always use:

Increasing transfer speed of SD card

Modify the following two reg keys to increase the transfer speed of your memory cards:

[HKEY_LOCAL_MACHINE\Drivers\sdcard\clientdrivers\class\mmc_class]

"BlockTransferSize"=dword:00000100

[HKEY_LOCAL_MACHINE\Drivers\sdcard\clientdrivers\class\SDMemory_class]

"BlockTransferSize"=dword:00000100

Increase font cache

To increase the font cache, speeding up font rendering at the cost of a bit of memory:

[HKEY_LOCAL_MACHINE\SYSTEM\GDI\GLYPHCACHE]

"limit"=dword:00004000

To change it back to the default:

[HKEY_LOCAL_MACHINE\SYSTEM\GDI\GLYPHCACHE]

"limit"=dword:00002000

Enable file system cache

To enable the FileSystem cache, speeding up overall performance at the risk of the cache not being written on a sudden reset:

[HKEY_LOCAL_MACHINE\System\StorageManager\FATFS]

"EnableCache"=dword:00000001

To disable again:

[HKEY_LOCAL_MACHINE\System\StorageManager\FATFS]

"EnableCache"=dword:00000000

Increase file system cache

To increase the file system cache:

[HKEY_LOCAL_MACHINE\System\StorageManager\FATFS]

"CacheSize"=dword:00001000

To return the file system cache to zero:

[HKEY_LOCAL_MACHINE\System\StorageManager\FATFS]

"CacheSize"=dword:00000000

Increase file system filter cache

To enable the file system filter cache, speeding up overall performance with file mangement:

[HKEY_LOCAL_MACHINE\System\StorageManager\Filters\fsreplxfilt]

"ReplStoreCacheSize"=dword:00001000

To return the file system filter cache to zero:

[HKEY_LOCAL_MACHINE\System\StorageManager\Filters\fsreplxfilt]

"ReplStoreCacheSize"=dword:00000000

Enable ClearType in landscape mode

To enable ClearType in Landscape mode:

[HKEY_LOCAL_MACHINE\System\GDI\ClearTypeSettings]

"OffOnRotation"=dword:00000000

To disable:

[HKEY_LOCAL_MACHINE\System\GDI\ClearTypeSettings]

"OffOnRotation"=dword:00000001

Note that your PocketPC LCD red/green/blue ordering required for proper ClearType display is only correct for Portrait display. You may or may not prefer to leave ClearType in Landscape mode disabled

Disable the security warning when installing non-certified application

To disable the security warning when installing a non-certfied application, set:

[HKEY_LOCAL_MACHINE\Security\Policies\Policies]

"0000101a"=dword:00000001

Note that this makes it easier for any malware to install itself.

Energy saving for SD cards and COM ports

When battery is very low it turns off SD card reader and some com ports like IrDA and BTH.

[HKEY_LOCAL_MACHINE\Comm\AsyncMac1\Parms]

"DisablePowerManagement"=dword:00000000

[HKEY_LOCAL_MACHINE\Comm\Irsir1\Parms]

"DisablePowerManagement"=dword:00000000

[HKEY_LOCAL_MACHINE\Comm\L2TP1\Parms]

"DisablePowerManagement"=dword:00000000

[HKEY_LOCAL_MACHINE\Comm\PPTP1\Parms]

"DisablePowerManagement"=dword:00000000

[HKEY_LOCAL_MACHINE\Drivers\SDCARD\ClientDrivers\Class\SDMemory_Class]

"DisablePowerManagement"=dword:00000000

Show / Hide sim contacts in Contacts

Shows all sim contacts in Contacts application.

[HKEY_CURRENT_USER\Control Panel\Phone]

"ShowSIM"=dword:00000001

And to disable:

[HKEY_CURRENT_USER\Control Panel\Phone]

"ShowSIM"=dword:00000000

There are some litle bugs in this ROM.

After playing with registry in HKCU\Software\Microsoft\Today\Menu I lost all my WM6.5 menus :(. I didn't modify anything - just were looking at values.