Got one of these on order - going to convert my 60lb. old PowerEdge 2350 PFSense firewall into a tiny appliance.
http://www.pcengines.ch/alix2d13.htm
Comes with a power supply and a hard drive :-)
http://www.dell.com/us/en/corp/desktops/inspiron-zino-hd/pd.aspx?refid=inspiron-zino-hd&s=corp
don't want a hard drive - using CF. Zero moving parts. Plus ALIX gives me 3 NICs and I'm suspecting less then 10watts of power consumption during normal use. I ordered the board / an enclosure / power adapter... I think I'll only need to provide a CF card once I get the parts in.