I'm not a security expert... but I'd love to hear from one about this. I know the old rule about physical access means your computer is pretty much 0wned already, but this seems to make it phenomenally easy.... especially considering this statement:

As of version 0.2.0, it is able to unlock Windows 8 SP0, Windows 7 SP0-1, Vista SP0 and SP2, Windows XP SP2-3, Mac OS X Snow Leopard, Lion and Mountain Lion, Ubuntu 11.04, 11.10 and 12.04 x86 and x64-bit machines. Signatures are added by request. <--- Basically these are the OS's we've done so far, many more to come!

tl; dr; Can we get a security wizard's input on this tool?