Just got an e-mail from AOL Beta today. They have just released GM Refresh Beta 1 of AIM for Windows Mobile. Here's the link to download the cab file:
http://beta.aol.com/projects/aimwinmobile/installers/mobileaim_1_0_49_1.cab
Looks like crap on my 800w I assume due to the screen resolution but the rest of you guys could probably use it effectively. The 800w has it's own multi-IM client anyways.