Right now I'm playing with the keyboard, as I don't have a PC gamepad available. Controls vary from title to title, but they detail the control layout in the game's entry (a bit of a pain getting back to if you're playing in full-screen mode, but do-able). Unfortunately I haven't found a way to remap them (although perhaps I'm not looking hard enough), although I wouldn't be surprised if that wasn't an option. Having to custom map controls for each title might suck.

I'm looking at picking up a PC gamepad this weekend (it's about time I bought one anyway) so I'm sure I'll chime in with more info then.