Whats the BEST IM app. for AIM/MSN messanger

[nopistn]

Ok, so I'm kinda new here and have read a few threads on this and seen a few differant ones mentioned so lets see what and why you think its the best...

Maybe we should start a Freeware and non-freeware catagories.

And if the phone actually already has one and I just havent found it yet someone please help me out.

Also it must (of course) work over wifi, as thats what I generally use for internet.

Thanks.