Just getting started, but I think I'm doing pretty well.
2005 Scion tC
Stereo
AIWA CD Head Unit -- relocating to glovebox
Carputer
IBM T23 laptop in port replicator in trunk under mat, next to spare tire
Rewired power button, moving to dash
4 port USB self powered hub
7" Dynamix 706 touchscreen VGA (
Link)
Garmin GPS18 USB using NRoute Software
Link
MediaCar frontend using Brushed Metal Scion skin
Using a power inverter for now for the laptop
Notes
Was a little nervous about ripping my console apart, but I wound up not having to cut it apart barely at all. Removed the Scion radio door contraption and placed the LCD in it's headrest shroud. Cut off the bottom of the shroud so the top of the screen could be viewed through the existing hole in the console (didn't want to cut the hole bigger). Used picture hanging wire to secure screen to console (it's in there very very tight

) Going to gather the power button wires and probaby put them in some heatshrink tubing to make it easier to work with.
It's amazing what you can get done when you're bored and it's snowing like hell outside! Going to extend the wires for the headunit and stick it in the glovebox, hope to make some sort of housing for it... anyone know of a "universal" plastic housing that'd encase a double-din stock radio? Comments welcomed!