Dlink has a network media player. The MedialLounge will play music, photos and videos on your TV/entertainment center. It has a pretty good list of media types that it supports (Audio: MP3, WMA, WAV; Image: JPEG, JPEG200, TIFF, GIF, BMP, PNG; Video: MPEG1/2/4, AVI, XviD)
I realy like the form factor, but I don't like the fact that they only have Windows software. Maybe they will release the protocol, and some one will come out with a open source server software.