The MediaMVP is a little device that allows music, photos and video to be streamed from a PC to a TV. It looks like it is based on an enhanced version of VNC, with some media streaming support. It looks like it cost about $100. It does look like the only server is for Windows.
It does looks like there is an open source project that is working on making a server for the MediaMVP. I downloaded the source, and tried building it on my Mac OS X, and it didn't work. It looks like there are some dependancies on some libraries. They should create a configure script to test for these dependancies.
Here is a diagram of how the MediaMVP works: