I really do enjoy linux. It's an interesting OS, in all its flavours. However, I have yet to have the time to properly configure my laptop at home to actually connect to my WPA-encrypted wireless network.
Because I'm more familiar with Windows (mostly with XP), I find it easier to simply make my Windows machine as trim and easy to use as possible. You'd be surprised how many people stare in astonishment when I turn on my PC and, within 15 seconds, I have my WinXP desktop and can actually USE my system ... it only took 15 years of computer experience to be able to do that.
Once I get some time, I'll pick up a linux distro (Ubuntu if I don't have much time, Gentoo if I do) and see if I can expand my knowledge to tweaking that OS. For now, though, XP does me fine, and I'm actually looking forward to my next Windows PC, since I like a lot of the Win7 updates. Might be another 5 years before I get a new PC though ... this one's only 7 or 8 years old yet.