Very cool. Seems perfect for a carputer!
...It is actually smaller than a business card, and runs a 1GHz C7M CPU. It will comfortably run XP all day long with the CPU pulling 3.5W worst case, but about .25W idling. The northbridge adds about another 3.5.
... Interestingly, the big chip in the center is not the CPU, that is the northbridge, the CPU is the little one immediately to it's left.
The board has 4 RAM chips soldered on, you can see two above the NB and the CPU, two others are on the back. This one has 256MB but 512MB versions are available with higher density DRAMs.