Truecrypt is dead. Long Live Truecrypt (with LUKS on linux!)

Since there's lots of speculation on the safety of Truecrypt binaries, if you're on linux, you can just forget about it.  LUKS supports truecrypt devices and containers with its own independent implementation.  Here's the TL;DR:

* Open a truecrypt container:

# cryptsetup tcryptOpen cryptfile mapper_device_name

* open a truecrypt container with a keyfile or keyfiles:

# cryptsetup tcryptOpen --keyfile your.keyfile cryptfile mapper_device_name

You can open a hidden or system by using the --tcrypt-hidden or --tcrypt-system switches.

EXAMPLE:

# cryptsetup tcryptOpen --keyfile bunnies.txt omgsecret.tc secretmapper

# mount /dev/mapper/secretnapper