oh wtf I wanted that game for a while, but Im on a shitty laptop that barely runs firefox. Had no idea its on 360!
On the subject of playing online on chipped systems/pirated games. I dont think you can get caught if youre sensible. My brothers friend has a chipped xbox and all his games are pirated, he plays on live with no problems.
Aaaand about games from the marketplace, Trials HD is pretty sexy. Really addictive sidescrolling bike thing. I recommend checking out the demo!