I've been reading up on this alternative to Windows Media Center and WOW... It blows me away! I was initially going to set up MythTV on a linux box, but this package makes things 100X simpler! Plus, this thing does everything. And by "everything" I mean EVERYTHING. Controls your TV/Cable/Satellite, DVDs/CDs, home security, lights, VoIP phone service, media cataloging/ripping/streaming... even allows your media to follow you from room to room! And more... a lot more! Plus you can get a Linux MCE remote with a gyro to point it and control your media (same technology that is in the Nintendo Wii).
Check out this demo video:
Now that is cool! I want to throw out my TiVo Series 3 HD and SlingBox now! (Well, once I get Linux MCE set up and running...)