W7 Upgrade?

There is some noise in the news and blogs about Windows 7 and the upgrade process. Even Mossberg writes about it, and there is a chart on his site. According to this, as a Non-Vista user, I am out of luck. But anyway, but advice is "don't", meaning: you better backup your stuff properly, and do a clean install. That was never wrong. (update: DownloadSquad has a simple version of the same information :-)