Since finding this site about one month ago, my mind has been racing about what I would want to do. First looked at FitPC but felt this would be too small for everything I would want to do. The next thought was for an Intel Atom setup (330, 1.6 dual core), but the reviews I have found were mixed. What I am looking for is the most powerful, lowest watt CPU that will allow me to do the following:
1) GPS
2) Media storage (digital audio/video)
3) FM stereo (with possible upgrade to Sirius)
4) Touchscreen interface
5) WiFi
6) Optional HDTV (would be perfect for tailgating)
7) Maintaining factory look (as best as possible)

Now to the hardware:
1) MSI Fuzzy GME965 Socket P motherboard
2) Intel Core 2 Duo T8100 Socket P, 35w
3) Corsair 2GB (2 X 1GB) DDR2 667
4) Hitachi 250GB SATAII Hard Drive
5) Bluetooth Adapter
6) PCI wireless card
7) Slotloaded USB DVD Burner
8) M3-ATX power supply
9) Lilliput 7" Touchscreen (either 629 or 701 model)
10) Bybyte Double DIN case (or make my own version)
11) AverTV Hybrid Volar MAX
12) Looking at Linux OS with nGhost for frontend

Additional bits and pieces like Cigarette Lighter USB, GPS receiver, etc

The car will be getting an audio upgrade as well during this process (~400-500 watt system).

With all items listed above, any problems, thoughts, or concerns that you, more experienced, guys might suggest.