I am all over the place. I spend a lot of time with Knoppix and other such flavors. I dont want a footprint to be left behind. At work though I spend a lot of time within Trusted Solaris. Not a nice of a tool to use for security work but great to keep people out of my systems. While I am not a security person per se I do wear my security hat so my security people can''t blow smoke up my rear like they try and do sometimes.