If you've been keeping up with the Windows 7 beta, you've probably noticed that Windows Media Center has really been focusing on fit and finish across the platform making it quite possibly the best DVR on the market. Two features for me really, make the TV features sing: Color-coded program categories and extensibility to support station logos.
Turning on Color-coded Categories: This feature is actually really easy to set. To turn it on, go into Settings>TV>Guide Page Options, and click the first checkbox option to "Apply colored backgrounds to shows, based on their category". You'll also notice the ability to set channels by name, a useful feature if you can never remember the numbers or your cable operator keeps moving the lineups around (or both, in my case).