Personal Machine:
Debian - offers unparalleled stability with excellent package system
Gentoo - stage 1 install - very, very speed - emerge is also an excellent package system
Ubuntu - debian with gnome pre-installed, what could be better
Fedora - nice for a quick, no hassle, setup
Server:
Debian - no GUI - stability, nothing more needs to be said
Gentoo - no GUI - stage 1 install - speedy and also very stable - more current than Debian
Gaming:
Windows XP Pro - w/ SP2 and any other updates :p - supports DirectX - crashes to a pretty blue screen when it decides it dislikes the brand of cheese in your sandwich
What happened to AppleNick with Suse? I have always viewed it as fine distro, just a little "too packed with crap" for me. I like a lean machine that I can customize to what I am using it for.