Backtrack end of story. I'm very into penetration(lol) testing. Although from time-to-time I do install the newer releases of Ubuntu, OpenSUSE, Mandriva etc., just to have a play around.
Ubuntu 12.0.4 with Windows 8 & OS X 10.8.3 (triple boot). Sometimes Mint, Fedora, openSUSE as virtual machines (Vmware Workstation & Fusion).
Allmost 4 years since I started this thread. It's so nice to see so many people using linux. I am still using debian and see no need to ever change. Be free, use linux.