Spanish company Fluendo is currently working on an open source cross platform media center called Elisa.

It looks very promising and if the project gets big enough this could turn into a very interesting platform.

It is a bit early in it’s development for me to try it yet, but I will follow it closely. Have a look at the screenshots and the screencast demo. You also find a Google Video Version of the screencast here.

http://video.google.com/googleplayer.swf?docId=2655766308298066594&hl=en