I use Windows 98, 2000, and XP, on different computers, all of which I use daily. In addition to that, my primary computer that I use is a dual proc AMD 2600+ MP with 4GB of RAM, running gentoo linux. I'm developing my own mini distro specifically for a
soekris box, which runs less keyboard, mouse, and monitor, and I'm programming the entire thing over a null modem cable.
I'm not biased against either OS. I just know what I'm using, and why. I'm not a windows zealot nor a linux zealot, I just know better than to think one is vastly superior over the other in every aspect, to the point where the other shouldn't be used.