I've had Burnout:Revenge for the XBox for several months now and absolutely loved it, but I went ahead and got it for the Xbox 360.  The gameplay tweaks are really nice, including ditching the odd boost-feature in the crashbreaker modes.  But what has really made this game rock is the detail you can see when it's played on an HDTV system (the not-very-professional photo was taken on my TV).  This is really a great example of where the experience with the 360 really rocks.  Gamespot gave this one an 8.8 out of 10, but I think it's closer to a 9.5 (a few minor gameplay annoyances keep it from scoring the vaunted 10.0 :) ).