Matt points us to an ultra-cool use for Media Center - in-car.  Hossweb.com has just about done it all to his 2002 Ford Expedition including touchscreen support for Media Center through his navi system.  He has a comprehensive demo showing how he does it, including demonstrating little-known features such as 30 minute rewind on FM tuning in Media Center 2005. Wow, this demo video and the install is thorough... looks like he did it with Windows Movie Maker 2.1

Video Demo (WMV)

Update 2: Video is back up.  Hoss notes this is a work in progress but it's pretty darn far along if you ask me.