Microsoft has made public their “edition strategy” (my term, not theirs) for Windows 7. While there are still too many editions, at least they make a little more sense, and offer a better overall choice, than what Vista offered.
Paul Thurrott has a write-up on the editions at his Super Site for Windows. He was “critical” of Microsoft for their edition strategy for Vista, and is now a major cheerleader for 7’s set of editions. He believes Microsoft has really simplified things. Lost on Paul is that when a 2,000+ word article is required to outline the various editions, it’s not simple. There are too many versions, but I’ll get to that shortly.