[gxnext]

palringo all the way, iv been using it for months. its been free for awhile now and it just works with all the major IM providers... only complaint is once u close a message screen you lose the conversation... but its better than paying for something similar. I hope it remains free forever....

*edit* aug 25, 2009 and palringo is still the best, but there are other options now like nimbuzz, which is a lil slow.. but it has some nice features like skype, gizmodo, and yahoo voice support. like you can talk to ur yahoo friends with voice for free which is pretty cool.. but i don't know anyone who actually likes to talk over yahoo....

The OZ that comes with the sprint touch pro is good because it allows you to stay logged in even if the program is closed to save battery. then as soon as you receive a im the program automatically opens to receive the im. I guess this is called push IM and as far as I know its the only program that does this for windows mobile.. I mean IM+ clams to do this...but its not the same. IM+ can have ur IM's pushed to a email address, it doesn't push it back directly to your phone and open the program when its closed.