I like AIM better, too... although IRC is the best, IMHO.
As for "using them all"... blerg, who really *likes* having half a dozen IM accounts to keep track of? Actually, it wouldn't be *as* bad if Trillian didn't require IE5+ to run MSN, so I could just use one program.

(And if GAIM didn't keep toasting my desktop whenever I tried to run it.)
Personally, I wish IM stuff was more like IRC... one standard universal IM server protocol, and then you could just use whatever client you liked best.
Peace & Luv, Liz