I'm doing a little research on the Atom Processor, and the D945GCLF motherboard:
http://formortals.com/Home/tabid/36/EntryID/84/Default.aspx
http://www.tomshardware.com/reviews/intel-atom-cpu,1947-7.html
Looks like the power consumption is around 25W, which is higher than I had hoped. I guess the higher consumption is caused by the graphics chip - the 945.