My girlfriend gave me a 120 W PicoPSU for Cristmas.

Why the 120W version? Well, it was the only one
available for express shipping to Sweden, a few
weeks before Christmas. :P

Anyway, I use it with a 12V, 3A power supply I
had lying around and these 36 Watts (V * A = W)
powers my EFIKA with 80 GB 2.5" HDD, ATi Radeon
9200 SE graphics card and an USB-stick for booting.
No problems at all. I even think I have plenty of
Watts to go before overloading the 36W PSU.

Incredible!