Actually... I don't, but should.
Here's the setup, it's been in place over a year:
7" LCD touchscreen mounted on dashboard.
Epia Mini-ITX M10000 1ghz computer w/ 512 RAM
20gig system drive (notebook) for software/OS)
250gig media drive with about 28,000 songs
OBD-II interface to connect with engine computer
802.11g card
Shuttlexpress tactile interface pad so I can control the system without looking
Webcam (as mentioned earlier)
Opus DC-DC power supply (no inverters, no A/C)
GPS
Bluetooth adapter
It's tied into my stereo too, of course.
