FIRST. (it is more likely than you think!) Oh look at me, so much dry internet humor.
I'll just start with the finished system. Or I should say, whats finished from tonight!
System is a POS old HP computer I had lying around. 2.8Ghz P4, 512MB ram etc. Running Windows XP and Centrafuse 3.0 for multimedia.

Cant see most of it, but maybe thats a good thing. I have plans to change this comptuer and have it run on a DC-DC power supply soon. Up next is how everything, or most of the electronics are powered.
2500 watt AC inverter, powers 31 band eq and three way crossover, and a 1600 (8 ohms sucka!) watt PA amplifier for the sub woofer.
Screen is a 7" USB touchscreen made by lilliput. It was really the only component I had to buy, and at $200 it was quite upsetting. but is the front end of the system, so it is quite enjoyable. Sadly signal is VGA only, no DVI (which is weird, if you think about it!)
The way the avalon DIN setup is, some super c-c-custom brackets were required.
I made a little module that regulates the car voltage to a 5 volt and 12 volt, remote turned on regulator. This powers the screen and a USB hub for touchscreen and other USB devices.
Power and distrobution for the rear systems, there is a battery in the truck which takes all the abuse.
8 amplifier channels for the bi-amped doors. (older, messier picture!)

You can also see my 500mW wifi antenna on the rear deck, melting in the sun!
Currently I have the WiFi operational, and obviously local media on the machine is playable. I'm messing around with a USB FM radio, and maybe even ShoutCast if I can jump local WiFi. The software Is loaded with Navigation, and I'm trying to get a SIRF III gps module to interface.
Thanks for putting up with all the pictures!
And I hope to have a video of it up soon!