I'm afraid that the compatability between xbox and xb360 is a little confusing. They say that selected titles will be compatable, and no one knows what that means <img src="/ubbthreads/images/graemlins/confused.gif" alt="" />
Personally, I think it means that every xbox game released now (or in the recent past) will be compatable. Microsoft always make the mistake of incompatablility, every time the release anything.
Besides, the hackers might release an xbox emulator for the xbox 360 <img src="/ubbthreads/images/graemlins/biggrin.gif" alt="" /> <img src="/ubbthreads/images/graemlins/biggrin.gif" alt="" />