Just came across a mini-ITX case by GTR (F202) for $60 which includes a DC-DC adaptor (ST-DCP100), 60W AC-DC "Sun" brick, and P4 connector. For the same price of a similar Pico+Brick, you get a free case too.
I compared the ST board against the Pico120 using several DC bricks (Delta 60W, Sun 60W, and a DVE 36W - from my NAS) and overall AC draw seems pretty much the same (ST was a hair more efficient with the Sun brick and Pico was a hair ahead with the Delta).
Windows XP idle = 31-33 W
Prime 95 = 44-48 W
Suspend = 29-32 W
Power off = pulsing 7W
Components include the D201GLY2, 1GB RAM, 2.5" 120GB Sata Samsung HDD, and 2x60mm fans.
Oddly the system in suspend mode draws about the same amount of power as in idle mode so putting it in suspend really won't save any power or lower the heat generated, and with the fans powered off this might even overheat the system in a tight case?!
For comparison a Synology NAS with a 3.5" 250GB HDD runnning off the DVE 36W brick consumes 40-60% less power.
Idle (drive spinning) = 18 W
Drive spun down = 12 W
Under load = 23 W
Power off = 0 W
One thing I did notice was I am unable to power down the board properly. XP will perform shutdown normally, but then the board doesn't power off and will start to reboot; I have to manually hold down the power button. This was the same even using a regular ATX PSU so can't blame the DC-DC boards. Did others experience this or just a problem with my particular board?