CentOS for the last 3 years, Fedora Core 1-5 for some years before that, Slackware for the 4 years before that, and my first distro as i remember was Redhat Linux 3, back in 96 or 97.
I have been using Linux on and off for a long time and Unix before that for some time (since age 10), BBC B computers before that from about age 6 (lots of people in my family worked in education and we always had latest computers in the house).
I rarely use windows now. I have another computer with it on, that i use for playing Stalker (all 3 of them) and Counterstrike, which is mainly comprised of the last generation of upgrades i had (currently a Nv GTS 250, 4GB DDR2, AMD 9750 on Win XP SP2). I dont play modern games on it, just games i like.