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Gee, goose, you stumped him! 
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Man, that was TOO easy!
Anyway, here is what I use (or what I would if I played certain types of games):
Driving = ACT Labs Force RS
Flight Sim/combat = Saitek X36 HOTAS combo
RPG = good old KB and Mouse
RTS = MS Strategic Commander
FPS = All about my Belkin Nostromo n50 speed pad. Also use an Intellimouse Explorer 3.0a
Platformer = MS GamePad USB