Some hacking and security distribution to try

So you want to learn the art of hacking or you want to be in the professional pen-testing? or whatever related to information security. You can try some of the security and hacking distributions which I've listed as below:

Backtrack: It is the highest rated and acclaimed Linux security distribution to date. BackTrack is a Linux-based penetration testing arsenal that aids security professionals in the ability to perform assessments in a purely native environment dedicated to hacking. Regardless if you’re making BackTrack your primary operating system, booting from a LiveDVD, or using your favorite thumbdrive, BackTrack has been customized down to every package, kernel configuration, script and patch solely for the purpose of the penetration tester. So don't miss this one.
Site: www.backtrack-linux.org

NodeZero: It is Ubuntu based linux designed as a complete system which can also be used for penetration testing. NodeZero uses Ubuntu repositories so your system will be always up to date. The system setup is basic and it's primarly designed for disk installation and customization as you want. With NodeZero comes around 300 tools for penetration testing and set of basic services which are needed in penetration testing. Also they are preparing a repository of pentest tools so your system will be up to date at all time.
Site: www.netinfinity.org

DEFT Linux: DEFT Linux v6 is based on the new Kernel 2.6.35 (Linux side) and the DEFT Extra 2.1 (Computer Forensic GUI) with the best freeware Windows Computer Forensic tools. DEFT it’s a new concept of Computer Forensic live system that use LXDE as desktop environment and thunar file manager and mount manager as tool for device management. It is a very easy to use system that includes an excellent hardware detection and the best free and open source applications dedicated to incident response and computer forensics.
Site: www.deftlinux.net

Katana: Katana is a portable multi-boot security suite which brings together many of today's best security distributions and portable applications to run off a single Flash Drive. It includes distributions which focus on Pen-Testing, Auditing, Forensics, System Recovery, Network Analysis, and Malware Removal. Katana also comes with over 100 portable Windows applications; such as Wireshark, Metasploit, NMAP, Cain & Abel, and many more.
Site: Katana Home

I'll update this post when I get to know more distros.