It should be noted that, unless the machine has been powered OFF (or hibernated, not suspended) for at least several minutes, it is possible for a determined attacker to overcome any disk encryption by cooling/freezing the RAM modules, transferring them to a different machine and looking for the disk encryption (session) key.
This will obviously render all the nice paranoid tactics void. So make sure you don't leave your machine unattended in a hostile environment unless it has been powered down for at least a few minutes (a few more in winter :-).
