MediaPortal

MediaPortal is an Open Source application ideal for turning your PC / TV into a very advanced Media Center. MediaPortal allows you to listen to your favorite music & radio, watch and store your videos and DVDs, view, schedule and record live TV as a digital video recorder and much much more. You get MediaPortal as Open Source software. This means you can help develop MediaPortal or tweak-it for your own needs whith lots of innovating plugins from our great community.

http://www.team-mediaportal.com/

I plan to install this as soon as I get a chance.