BackBox Linux 2
The BackBox team is proud to announce the release of BackBox. Linux 2.BackBox 2 features the following upstream components: Ubuntu 11.04, Linux Kernel 2.6.38 and Xfce 4.8. BackBox is an Ubuntu-based distribution developed to perform penetration tests and security assessments. It is designed to be fast and easy to use. It provides a minimal yet complete desktop environment, thanks to its own software repositories, which are always updated to the latest stable versions of the most often used and best-known ethical hacking tools.

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http://www.backbox.org/content/download