The Remote Exploit Team is ecstatic to announce the public release of BackTrack 4 Pre Final (codename “pwnsauce“). A VMWare Image of BT4 will be released in a few days. We have major changes in BackTrack, and have tried to document and summarize them as best as possible. See the BackTrack Guide PDF for more info.
see http://www.offensive-security.com/blog/backtrack/backtrack-pre-final-public-release-and-download/ for more info and http://www.offensive-security.com/backtrack4-guide-tutorial.pdf for the 'BackTrack 4 – The Definitive Guide'