Thought I'd post this over here as it seems relevant. Here's a couple videos of an Apple TV installed in my 1999 SC400. Not a finished project yet, just got it up and running. I will be making a few software modifications to the Apple TV to allow web browsing and installing Boxee to gain access to more streaming media.

Booting:
http://www.youtube.com/watch?v=7lPq7iUrqPA

In operation with alphabet search:
http://www.youtube.com/watch?v=aNHEGuTrtYY

The thread with pictures of the installation:
https://www.clublexus.com/forums/sc-...-upgrades.html