Windows Media Center!!!!!
I do a lot of personal travel so I am loving the fact that I can synch my recorded content to my Zune and take it with me. I'll never miss my favorite reality TV shows again. Even better I can turn my laptop in to a TV with the addition of a TV Tuner and an antenna. You can also use your Xbox as a media extender and enjoy Windows Media Center content (music, movies, television programs, etc.) in any room of your house.