I've been doing some work (with some friends) on creating an in-car HUD, running Linux of course. We've made some progress on talking to a '95 Camaro Z28, using 8192 baud serial ALDL. One of the secondary reasons I got an Empeg was to host such an application.
If anyone would like more information on what me and my buddies are doing - and remember, this is only good for ODBI, '95 Camaro Z28's, please let me know.

Dang