I was browsing digg.com and found a topic about a open source media center alternative. I'm downloading it right now but it looks awesome:
http://mediaportal.sourceforge.net/
MediaPortal turns your PC in a very advanced Multi-MediaCenter / HTPC.It allows you to listen to your favorite music & radio, watch your video's and DVD's, view, schedule and record live TV and much more. You get Media Portal for free/nothing/nada/nopes and best of all it is opensource. This means anyone can help developing Media Portal or tweak it for their own needs!