I was reading this thread on the Green Button here page 19, seems there's a newer Windows 7 build doing the rounds and here's some new screen shots of Media Center in that build.
There's an option in the guide to color code shows by category.
Similar movies and future recordings integrated.
While watching a movie you can view the cast, and view other movies they have directed, produced, or acted in.
Check out the thread here on this page where you can view full sized screen shots.
If your wondering where to get your hands on this build take a look see here.