My thoughts so far:

Control is already handled by a remote or through the sony stalk.

Video. The fastest interface on the empeg is the ethernet interface. So, we're in need of an ethernet to composite video adapter. Amazingly enough, no one makes one. There are a few video-over-ethernet encoders/decoders, but they're not designed to receive video from a computer. Back to the drawing board (or google search box). What has an ethernet jack and a composite video interface? A videophone. Will it auto answer a call and full screen the video? It sure seems like it from the manual.

Now, the only problem is a H.323 implementation for the empeg that will dial a set IP address, and send the screen contents as the video. My limited perusal of sourceforge hasn't found the right open source project to canabalize yet, but this seems like a good start.

Matthew