Backtrack 4 Beta is available, but so is Samarai (from InGuardians) and  more:
BackTrack
Chaox-NG
Damn Vulnerable Linux ( DVL )
DEFT
FCCU
Frenzy
grml
Hakin9
Helix
HeX
KCPentrix
Knoppix-NSM
Network Security Toolkit ( NST )
nUbuntu
Ophcrack
OSWA Assistant
OWASP Labrat
Protech
Russix
Samurai
Stagos FSE


http://remote-exploit.org/backtrack_download.html


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