This is a WM6.5.1 ROM, based on the 2.08 OEM ROM and 23047 XIP/SYS from Da_G.
All it has got is the bare minimum OEMDrivers, plus a fully featured SYS (some of the SYS applications have been tweaked: removed extra screen layouts for LockScreen, removed SampleMusic etc, UPXed a few things).
The XIP has been tweaked quite heavily to get the best performance, and you should be able to add whatever you like to this ROM and it should remain stable.
Try it and see (and install whatever keyboard you feel like using).
This will probably act as the basis for some "full" ROMs afterwards.
New build (09102601)
[+] Updated to 23081 (thanks to Da_G)
[+] Comm Manager reskinned[*] New Leo SIP build
New build (09091301)
A few screenshots of this ROM (on a Diamond)
[+] Updated to 23047 (thanks Da_G)
[+] Skinned Comm Manager
[+] Comm Manager switched with Topaz one, WiFi might behave now
RUU + ROM
New build (09090401)
[+] Updated to 23409 (thanks Da_G)
[-] Removed VoIP
[-] Removed MSVC (Cab)
[-] Removed WindowsLive (Cab)
New build (09082804)
[*]Replaced IME with older (hopefully stabler) version.
[*]Fixed the ringtone causing crashes for no reason
[*]Fixed widgets etc.
[*]Updated to 23037!