The hard way:
,----[ Microsoft unveils Vista upgrade matrix ]
| Microsoft has already laid the groundwork for confusion over the release
| of Windows Vista, with their announcement that the new operating system
| will come in as many as seven different versions.
`----
http://arstechnica.com/news.ars/post/20060730-7384.html
The easy (and free/Free) way:
http://distrowatch.com/
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