The TiVo Desktop Software provides easy access to music files and photographs stored on your home network using your local network. Any other system with access to your network; a computer, a TiVo DVR, etc., will also have access to the music files and photographs stored on your home computer.
G3 400MHz+, Mac OS X v10.2 or later, iTunes 3.0.1 or later required for music, iPhotos 2 or later required for photos.
More info and download link here.
Of course, you need the Home Media Option ($99) to take advantage of this software. And BTW, that’s not available for DirecTV with TiVo units (Hughes HDVR2)…
On the plus side, the desktop software is very nicely done — it works as a plugin in the System Preferences app.