I use an eeepc with a 160gb drive. I took the arm rest console box out, chopped it in half and then cut a section out of it and plastic welded it back together so it's skinnier. This left an empty spot under the armrest/center console where I could mount and aluminium bracket and slide my eeepc in. It goes in with the lid closed and connects to a touch screen on the dash mounted in front of the stereo. The eepc is hidden and I just put it into sleep mode as it runs off a second battery anway. To wake it up I have a loop back cable connected to the lan port and a press of a button on the end wakes it up without having to pull it out and open the lid.
The eeepc runs all my music,videos, 3G Internet, wireless internet, syncs with my homepc when I drive in the garage, used to download pics from my camera toit when on the road. I even use it for video skype calls to my 2 year old daughter when I'm away wheelin for a few days. On top of all that it runs street mapping and oziexplorer for topo mapping. A brilliant setup that I've been running for over 2 years with no problems.
Cheers
Steve