It appears that Microsoft has announced the versions for Windows Vista. There is an article on engadget that lists 6 different versions. I don't know how much of these new versions are the result of market surveys and how much it is the result of lawsuits over the bundling of tools but I think it will be confusing for some people. I suspect that the big box retailers will have just one or maybe two different versions that they sell and it will pretty much boil down to you buying that one but I can see problems for programmers if we have to remember what version of the OS has what tools installed on it and more especially if certain functionality is disabled because you don't have the right version.