I currently use Debian (testing), but like many Linux users I've given many distros a go.
I bought Suse, in a box, back in the late 90's - I still have the disc set (I think it's 4 or 5) and actual manual! I used that for a quite a few years. The next distro was Mandrake (now Mandriva). And other than that I've used Debian, Ubuntu, Slackware, Arch, Linux from Scratch, Slax, FreeBSD (not linux!), NetBSD and OpenBSD in varying quantities since then! I gave up entirely on Windows quite a few years ago and have been much happier since.
I am an amateur hacker (in a good way) and enjoy making silly games or learning new programming techniques, but sadly have very little time for such things due to family and work.