I use: Mandrake Linux 9.2, Windows 98 SE and Windows XP Professional. I use windows for games, and Linux for school-work and programming.
But sometimes i play DD on Linux.
One of the cool things about Linux is, that the most of the software is free, and can be downloaded from the internet. The bad thing about Linux is that it dont have DirectX, that many games requires. Therefore i use windows for games.
(i'm using Linux in this moment)