So small, I really thought they would be larger. (I can always put the mini in a larger computer case with a noise generator and blinking lights to get that effect though, just for when company is over of course!

)
Indeed they're tiny. And now that they take 6-pin PCI-e for the miniplane, we have the option of using them seamlessly with a desktop PC if desired. Add them to the 5.25" bays of your fileserver/HTPC etc. if that's more efficient than using a separate computer. Or still hook them up to a laptop or rpi and do the paperclip trick to turn on the ATX PSU.

Waiting for the go on 12V and I will order my Cooler Master V450S at 92% efficiency. (We need that with the rates here in Germany nearing .28 kwh)
Very nice.

I've dug up three suitable PSU's lying around (typical nerd

)
Already on hand and efficient enough.

This is for 4x boards on 1x miniplane (so ~120W from the wall) and a Dell Mini 9 (~6W from the wall) to run it. Looking to use Win 7 32-bit on its 16GB SSD (using RT Seven Lite to slim it down a bit).