I must say that the 360 controller is by far the best I've ever used. I'm using it to play gears of war on my laptop and it just works so well for it. I'd love to get a 360 but I don't want to splash out before I can get the whole package inc. a big freaking HD tv.
I personally prefer the xbox's triggers compared to the L1 and L2. Feels much better when playing FPS games.
[facepalm] My XBOX sounds like a jet is landing on my house and I can use it as a furnace if I ever need heat. Library of games is really great though. The PS3 has an impressive library too - Uncharted: Drake's Fortune, Ratchet and Clank Future: Tools of Destruction, Call of Duty 4, Motorstorm, Folklore, Warhawk, Resistance: Fall of Man and lots more coming soon.
