As far as I can tell, the temperature sensor on the die is not working, otherwise it would show up under the "Temp" column in the list of devices.

See screenshot of MinePeon: https://www.dropbox.com/s/nw0b10iqhrh7432/Screenshot%202014-01-22%2010.57.07.png

I have not overclocked yet.. I am a bit apprehensive to OC without a working temperature sensor. I think I'll just wait to hear how other's OCing experience goes before doing so myself. They shipped them at this clock rate for a reason.. I'm sure they tested heavily with higher clock rates and saw stability problems/failure of hardware. There's probably a little wiggle room to overclock, but I wouldn't bump it up too much (especially because of the aforementioned broken temperature sensor.)

PS: I'm thinking that the first device hashing at.... 12 Mh (lol) is the CPU of the Raspberry Pi...