My main machine uses Win2k, My other machine uses:
http://www.linspire.com/
and Kristin uses a Mac. Win2k is stable as hell in my opinion but since they have stopped supporting it I will soon move over to Linux and probably get a Mac for Graphics.
Everything after win2k is a death trap - Vista will end MS in court over privacy issues. The only thing saving MS is the cost of a MAC, that is where something like linspire might help PC users. FireFox is proof that MS can and will lose market share over its security issues.