I would like to retire my MediaCentre and just use my Xbox and Tivo which both are HD

I have no probs with ripping DVD's and playing on Xbox & Tivo.
Downloading AVI and playing on Xbox & Tivo

But I cannot for the life of me stream my Itunes purchases to either devices.

Have tried lots of so called streamers (nero and a few others), mixed results on avi but no joy on MP4.

 Failing this I guess I will start up the media server again.

I tell you the formats and DRM just drive you mad when its is way easier to just steal the stuff.