I'm working on a project that isn't exactly car-computer stuff, but may be of interest to people on this forum; it may even have a place in a car at some point. The project is called Dunbar and is a program for mobile devices (right now, Windows Mobile devices) that works like a social networking/chat program, but location-based. The program gets your location from a GPS receiver or uses cell phone tower data. It then shows your 'buddy list' by showing everyone's distance from you and shows their location on a map. The program requires a dataplan or some kind of connection to the internet, but the program takes care of the rest! It's free of course, and is in development, but there is a full working version, and web site to accompany the program. Check it out here:
http://www.warnockinc.com/Dunbar/
If you are interested in the program or helping w/ development, there is also a Google Groups page to discuss the project.

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OrbTS RR Plug-in
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Progress - VIA EPIA SP8000 | 120 Opus Power Supply & Case | 1GB Ram | 120GB 2.5" Hard Drive | Bluetooth 2.0 | GPRS/3G | PhoneControl | Road Runner | iGuidance 4.0 | Lilliput 7"
Pending - USB Hub for NES controllers