I keep a windows pc around but I rarely touch it anymore.
My girlfriend who lives with me uses it but I rarely do.
I do have a windows xp install in virtualbox on my vector machine if I have to use anything windows based.
Thats for the few things (sound/video apps and games) that wine does not work for.
I think vector and linux have progressed enough that windows becomes almost unnecessary. I was just at a friends house and he was trying to show me some things and his vista based computer crashed and crashed and crashed. I should say applications did, not the whole machine. Thats microsofts definition of progress on stability... Used to be the whole computer crashed, now just the app your using, with unsaved data crashes.
I rarely have any problems like that with vectorlinux, and when I do, its usually my fault