Uhm, first, you can roll anything between 1d2 and 15d999 on AIM chat. //roll-diceX-sidesY, like say, //roll-dice2-sides20 is a 2d20.
Second : AIM is far superior to MSN (you wouldn't believe the trouble I've had with multiple-person chats on MSN ... it makes it near impossible to talk to other people one on one in the chat, like if the DM and a single player need to talk, because the chats will jump between which is the group and which is personal.
Y!Ms not too bad, as far as I remember.. >_>
"He who lives by the sword dies by my arrow."
"In your histories, there are continual justifications for all manner of hellish actions. Claims of nobility and heritage and honor to cover up every bit of genocide, assassination, and massacre. At least the Horde is honest in their naked lust for power."