Interested in getting rid of that boring old Holiday Theme but don't want to just buy something at random only to find out that it's complete crap?
Theme Xbox to the rescue! Save yourself from spending 250 points on the crappy Fable 2 themes by checking it out here. It gives previews of what your friends list, media section and everything will look like.
A word of warning: the site is pretty bandwidth intensive. It seem like it loads up a high res screenshot of every theme so if you still live under a rock and have dial up you definetely want to avoid this site.
EDIT (4/2/09): God Damnit! As soon as I post this blog they pull the site down! How did I time that so badly? I'll update this when they put it back up again