Apple has been doing 10.x for a while now. Most FOSS stuff (well, at least the stuff I program for) doesn't change the number before the dot unless there's an API incompatibility. I'm sure there's lots of Microsoft detractors that would just want to say, Windows 7 really is just Vista (and therefore just as bad) because the number has changed so little. Please. While I'm not a Windows user and definitely not an MS fan, arguing the merits of software based on the version number is just silly.