It's no secret that thousands of $35 Raspberry Pi (Model B) computers have just shipped to people around the world. With these, and other similar types of computers becoming cheaper and more available, what are the security implications?
So as to not leave this question too open-ended, I'll specify: I'd like to know what practical applications such mini-computers have in IT security, or what role they could play in cyber-defense, network analysis, etc.
And on the flip-side, what risks might they introduce to a local network environment that should be considered? Remember that they can hide in small places, operate without noise, and are powered by something as common as a cell phone charger.
Note that I'm not referring to portable USB utilities that need a host system on which to run or boot into, but I mean actual stand-alone hardware devices.