Backtrack 5 was a live cd for forensics tasks.
After Backtrack 5 came Kali Linux 1.0. Two years ago.
http://distrowatch.com/index.php?dis...h=all&year=all
Then Kali Linux 1.0.4, Kali Linux 1.0.6, Kali Linux 1.0.7, Kali Linux 1.0.8,
.. and Aug 2014 the latest : Kali Linux 1.0.9 .
-