It seems the majority skips a version of Windows.
Win 98 was popular, Windows ME was a failure (although I personally liked it better than 9

XP was obviously massive, Vista was a let down.
Windows 7 has become widely accepted, and I get the feeling that Windows 8 won't be a hit with consumers..
ME and Vista were both thought to be rather buggy operating systems, the jury is still out on windows 8, it may not be buggy but I don't think a lot of people like the interface.
Personally I usually adopt the latest, I will probably keep Windows 7 on my workstation for a while yet, but I am seriously considering a Microsoft Surface tablet with Windows 8.