Just to be clear again about Truecrypt : TrueCrypt can be "installed" on a USB drive but you can not use it if Truecrypt is not already installed on a PC.
Now that we've thrown 'em off the trail, use the form below to get in touch with the people at Engadget. Please fill in all of the required fields because they're required.
Just to be clear again about Truecrypt :
TrueCrypt can be "installed" on a USB drive but you
can not use it if Truecrypt is not already installed on a PC.
http://www.truecrypt.org/docs/?s=administrator-privileges
So Truecrypt is not a fully portable solution.