A new version of TrueCrypt, the open source on-the-fly disk encryption software, has been released. This update bumps the version number up to 5.
Among a Linux GUI and several other nice things a real biggy is a new feature that allows to encrypt complete Windows installations. You don’t have to reinstall Windows, the software will encrypt files on-the-fly while you’re working.
Unnecessary to say but encrypted file-systems do not deliver the same performance as unencrypted ones.