I use its fork - RealCrypt.
Why?
Because it's only available in my favourite distro's repository.
There were some licensing issues with
truecrypt, that license was non-free, so
realcrypt is a fork only in order to fix license.
Truecrypt was removed from most distros.
Of course, I can download
truecrypt fnd set it up manually, but what for? I just click "install" on
realcrypt package in my package manager and get all the same.