Well, it's basically a Pentium Celeron 600MHz PC in my truck. I built the whole thing myself last year in the Spring. I've had ZERO problems with it. People don't believe that, but the drives these days are rated around 2G's for shock. Unless it's a really bad bump/pothole, it never skips or gives me any problems.
It's got a 80GB hd, cdrom for loading up MPC's onto the hd that I burn in my house, floppy, two internal fans for cooling during warmer months, and a touch-pad for control. A keyboard sits in my back seat in case I ever need to use it. It's all powered by a ATX DC/DC convertor to convert the truck's electric to regulated DC for everything. For visual I use a 6.5" color LCD screen hooked to a VGA/NTSC convertor so I can use the monitor port on the motherboard for the LCD screen. The max resolution is 640x480(VGA), but that's good enough for reading Winamp or the regular Windows stuff(Windows Explorer, etc.). Here's a few new pix I just took. The cd player is being used in my house right now for an experiment but it'll be installed again. Sorry for the fuzzy shots of the display.
http://home.att.net/~aszablowski/perspix/mpcmb.jpg
http://home.att.net/~aszablowski/perspix/mpchd.jpg
http://home.att.net/~aszablowski/perspix/mpcwinamp.jpg
http://home.att.net/~aszablowski/perspix/mpcwindows.jpg
http://home.att.net/~aszablowski/perspix/mpcplayer.jpg
I gotta get some night shots of the screen. It looks very cool at night. The display is mounted where my stereo used to be. No need for that anymore!

It's a little crude but I really was limited on where to put the screen safely and have it a little theft-proof. I put the tinted plexiglass in front to make it look a little better. So, that about sums it up. Oh, and yes, the truck's got a top-tier alarm system in it. I love this thing and I don't miss commercials!