You can do this already with Windows Media Player 11 (or Zune software) and Windows XP.
You can share pictures, music, and WMV video files. It works great...Although i wish they had support for MPEG video files as well.
EDIT: Sorry, I guess I didn't read carefully enough, I thought you already had an XBOX 360. If you are looking for something to stream music and pictures to your TV, there are products available, but I'm not familiar with them since I use the 360 for this purpose
Last edited by odiovidio; 2007-01-23 at 10:10 AM.