Mandriva 2005LE.
Because Mandrake 7.1 was my first distro (5 years ago, go figure :rolleyes:), I tried all of the releases, tried Suse, RedHat, Gentoo, Slackware, Debian, (K)ubuntu (Hmmm, not bad at all), and came back to Mandrake/Mandriva, because I'm lazy, and mainly because I know it well, so I can tweak the scripts a bit 8o