Shut up. Loads people use them now. And the youtube clips suggest they dont own with k+m padders hold their own. People have the right to game with what they feel is comfy. Microsoft just cannot be arsed to implement. XIM3 is going commercial what it take off.
It's called a level playing field, that and a console is generally designed to be used in a lounge environment, not at a desk. I'm sure if Microsoft wanted to implement it they could at the click of a finger, but they don't.
Really, if it winds you up so much why not just play on PC? If all your mates are playing on XBL (with pads) then why is it such a ball-ache for you? Do one or two extra kills per match really matter?
I, personally, much prefer using a pad these days for gaming (although admittedly that is probably because I use a mouse and keyboard all day at work), but then gaming is a form of entertainment to me these days not some ultra-competetive twitch fest that a lot of multiplayer PC games seem to be.