One thing that Linux and MacOS X users enjoy over their Vista counterparts is that they don't have to worry about choosing an edition of their operating system or upgrading to the same operating system but to a different edition, e.g., from Home Premium to Ultimate works but Home Premium to Business doesn't.
The Windows SuperSite today has an article about the editions that are being removed. Also, each edition is a super-set of the previous one, so upgrading is much simpler since there aren't any distinct branches anymore in the editions.
That being said, I still think they are still too many versions. There should be only 3, Starter, Home and Professional with the starter edition being targeted at netbooks only.
