Recently I've been getting much more enthusiastic about using Linux, having used Fedora Core something (4?) the summer before last while working on a project for the Cogent Computing ARC and doing a lot of work over the last few months with Gumstix (which come with some Linux distro, can't remember what) and Ubuntu. Then there's Knoppix which I'm using in its LiveCD form as a host system to develop my own distro based off of the guide at Linux From Scratch. Basically, I'm thinking of migrating almost all the things I do over to Linux in some form or another, possibly only keeping Windows (specifically XP, not Vista, see below) to play various games on and stuff. Besides, all the useful tools are written for Linux anyway...
This decision has been helped slightly by my discovery of various items in the Vista EULA, as mentioned here (3 pages for you =P ) and here, and I won't even go into the "Trusted Computing" nonsense or the related insane pushing of DRM at the system level (right down to the hardware itself).
As a side-note, I'd like to point you to this purely because I hate iTunes with a vengeance.
Anyway, I think that's enough to read for now. My feelings towards Windows have moved very fast towards dropping it recently, and that doesn't seem like it's going to change anytime soon.