I use just MSN now. Used to use AIM, but it sucked and I got a load of n00bs on it just randomly adding me.
The best messenger would be a combo of all three. Yahoos emoticons, msn's GUI and little features and what not, aims file transfering, lie if u send a file and it fails, u can continue it later. And stuff like that. Each messenger has things that could be improved upon..Thats why i use all three. Jesse
i use msn because.....i do...i use yahoo too cuz that's what all my friends have but i have over 60 people on msn, 90% of which i talk to regularly
im not sure tho i use AIM because more of my friends have it. tho aim sucks bad and i hate it so much! they got a bunch of morons programing it! i use IM2 some times too cause it works with aim, msn, yahoo, irc, icq and some other stuff too i think. also xfire for gaming.