I tried MythTV. Version 0.20 includes UPNP MediaServer profile. After fixing a small problem in URL escape character handling I was able to get it working with Media Streamer on N800 but unfortunately N800 does not support MPEG2 videos. To view anything on N800 I will have to transcode from MPEG2 (which my video card produces) to MPEG4. I did not try the audio support. - J