What is your favorite operating system?

Windows 7

Win7 for the common use and Linux Ubuntu for servers ;)

Windows XP Professional SP3

seem like win7 for most of people here,I'm using 4 debian boxes at home

windows XP!I think that is more stable.

Win XP sp3. I don`t like Vista and Win 7 .

windows XP

Windows 7.
It rocks dude!

Windows 7 is the best , Vista was really bad

Windows 7 FTW windows vista sucks Xp is also good