I'd also recommend this site. It will tell you the EXTENT of the BC. For example, I got Tony Hawk 3 for the Xbox and it would boot up and nothing would come on the screen, and I thought the game I had was broken or something. After finding this site, I discovered that I needed to change my 360's resolution to 480p for the game to work:
[ame="http://en.wikipedia.org/wiki/List_of_Xbox_games_compatible_with_Xbox_360"]List of Xbox games compatible with Xbox 360 - Wikipedia, the free encyclopedia[/ame]