Backtrack is made up of a lot of different tools, some you may use and some you may not. For a great all round Pen Testing course using BackTrack check out Penetration Testing with Backtrack from Offensive Security.
Also have a look at the Metasploit Unleashed course, also from Offensive Security, this one is free and regularly updated.
For individual tutorials using the tools included securitytube, youtube and vimeo are great places to look.