I am one of those geeks that has a Mac OS X on an iBook, Windows XP, Zaurus and a PPC linux on an green iMac all running on my desk at work(synergy confuses everyone with that mix, you shoudl see the looks when I go off the windows screen onto the Z). The Mac and the Zaurus get teh most uses but I use all of the machien at least once everyday. At home it is Linux on all of the machine except my ibook, and windows on a few of my vm under vmware server so I can test things if needed.
For years I only ran linux or FreeBSD on my work on home machines. Then a few years ago I deiced that in most cases linux was teh best tool for the job but there where times windows was the best tool.
I do have two licensed copies of windows(XP and 2000) that i got from school(At least I think the license is still good). At this point the machines that get used ona daily basis at home at all linux(yes my wife uses linux to surf the web, email and chat) so I am not to worried about microsoft shutting off my machine. I guess I will have to wait and see what happens to see if I can turn on my vmware vm with windows after they start shutting turning off windows.
I am just glad I am not 100% depending on windows, but then again I have been made fun of at work sicne i used my Z as my only computer for a week(windows machine was broke and I had not got my ibook yet) and still got all my work done without a problem(somethings I got done faster since I had my Z with me all the time).