I just happened to notice that BackTrack 3.0 Beta has been released.  BackTrack is an amalgamation of two previous projects; WHAX and Auditor.  This CD is full of useful tools for conducting penetration tests.  New features include a python development environment, updatable exploit archives for milw0rm and Securityfocus, one-click setup for Nessus and Snort, and the inclusion of the free VMWare Player.

I havn't had a lot of time to experiment with it, but I did find that the current beta seems to have poor WiFi support.  They do mention WiFi scripts and drivers on their to-do list.