GeeXboX is sweet
I'm playing with GeeXboX, a tiny 7 megabyte linux that turns an old PC with a TV-out card into a Home Theatre Media centre that plays most video and audio formats locally or over the network. They even provide a package to let you compile your own customized version. It runs from a CD, HD, or USB.
Netstreaming means that I can listen to 2SER over the internet even though I'm in a bad reception area, and I can just add new TV channels by adding web stream URLs to my custom build.
