I line everything with depleted uranium, so the whole setup weighs a good half-ton.
The weight of the PC is going to depend on all the components. If you go with small formfactor PC, you can easily get a system that eighs no more than a few pounds.
Considering I've got a GPS receiver, Sirius connect box, full-size HDD, GPS receiver and such all in a case made from 1/2" MDF, My setup isn't light. I figure it's a goot ten pounds for the box that is my PC itself.
And I gotta go with IC-C30 here. Why do you care? Are you installing on a bicycle or race car where weight is a major issue?
Have you looked in the FAQ yet?
How about the Wiki?
Under normal circumstances, a signature would go here.
white breamworking on a trilogy: CARGO - UNIGO - MERGO CARGO = the Car Computer
Intel Celeron M, [P]SDC, uBlox GPS, GPRS, WLAN, Silabs FM, RDS, TMC,
Dual-audio, Onecable TFT, Microsize: 45 x 108 x 168mm (1.8 x 4.3 x 6.6")