Ask Slashdot: Audio/Video Networking Solutions for Linux?

Brad Andrews asks: "I recently finished building a new house, and networked it to provide central control over ambient audio levels and possible distributed video. I'm curious whether anyone has heard of a linux-based solution for central video and audio service, with a focus on MP3 and DVD, that I could combine with TV out ports and AC-3 decoders so I can watch the same movie from anywhere in the home. I'd prefer an x86 architecture, but if there is a complete integrated solution on another platform (StrongARM?) I would be interested in that as well. "