What do you guys use?

Oh - and just for the record I currently run Ubuntu 10.04 LTS on my main box; it is starting to get a little long in the tooth (both the OS and the machine). When I do get around to an upgrade, I'll probably switch to Mint or something else - not sure what, but I don't really like the direction Ubuntu has gone recently. I've been running Linux in some fashion or another since 1995 or so; for my current work we using Macbook Pro's with Lion installed (other places I've used Ubuntu and Windows of various flavors). Never used anything later than 98SE at home, though, when it comes to Windows installs (and that particular box was squirreled away in my server closet and accessed via VNC because I was running an edition of Quicken I needed for bill paying - I've since dropped that).