From JWZ passed on by my buddy @halkeye: Bypass full-disk encryption and passwords on any powered-on computer via Firewire.
The tool can unlock (any password accepted) and escalate privileges to Administrator/root on almost* any machine you have physical access to. […]
Well of course, any machine you have physical access is kinda screwed, unless you use some sort of encryption like ….
It is primarily intended to do its magic against computers that utilize full disk encryption such as BitLocker, FileVault, TrueCrypt or Pointsec. […]
Kinda scary, but the circumstances needed (powered on, has firewire, physical access, etc) make it not needing to run around screaming just yet.