I’ve written about TrueCrypt in the past, and mentioned how it has suddenly become hot news "thanks" to a ruling that US Customs can search the contents of your laptop without "probable cause".

TrueCrypt just updated this powerful open source application to version 6, and added several new features. TrueCrypt 6 now supports multiple core processors (which you’ll find in almost every new PC). It can spread the encryption/decryption load over these cores, making things much faster.

It also adds support for a hidden operating system. With a hidden operating system you can completely hide and encrypt your entire Windows installation. If you do end up getting asked to turn your machine on, you can even boot into a decoy operating system where you can show that you have nothing to hide!

TrueCrypt 6 is free, and be found here.