KaiserTweak
Yup also using this, has some great tweaks in there although some options are black or white, when I want grey!
HTC Action Screen
Didn't find this one much use to be honest.
HTC Home Screen
Came with my ROM!
Touch Phone Dialer
A pretty good 2G dialer to replace my 3G dialer, but the latter looks horrid so I am waiting for a non beta 3G dialer.
Windows Mobile Black
Got this and the tweak to actually make it proper black, looks much better! Also got some ultimate wallpaper on the go!
In addition, I have been doing my own research!
Remote Desktop
Another obvious one, seems to work pretty wel although not really useable - good for emergencies?
Black Calcular skin from the Elf
Exactly what it says, to replace the Windows 3.1 style one
Commercial stuff
Google Maps, Opera, Live Search, Live Messenger, Yahoo Go, Total Commander, WinRAR
Funky Stuff
WorldCard, Quickmark
HTC Touch Keyboard + Keypad
Pretty and black but pretty huge too.
10 button Comm Manager
Looks better than the blue background one and has more options too!
Work continues, screen looks pretty boring, but fits with both the keypad opened and closed.