OurColony has released an Xbox Team Interview.
Microsoft has a Fact Sheet up on the XBox website that details the current spec.
Perfect Dark Zero has been shown and it doesn't look as good as everything else, but then it is a launch title.
CliffyB's new game is Gears of War and it looks stunning.
And somebody mentioned that to code for the XBox360 you have to know how to do Parallel Programming because of all the multichip, multicore things that are going on. And that doesn't surprise me, but it is as close as you can get to rocket science under C++. So the sooner the industry ditches C++ as the language of choice the better.