I've been a Windows 7 64 bit beta tester since it was publicly released. Win 7 is *not* beta quality software, I play games, code, some graphics design, everything works without any issues, and not only that, it's faster at *everything* that Vista 64 bit was on the same configuration ^^.
I can't wait to upgrade to win 7 at work, I'm so horribly tired of XP, ... I'm cringe every day when I have to use XP, especially the lack of integrated search is really killing it (and no, neither Google desktop search or windows desktop search work well enough in XP).
However, business never upgrade straight away ... regardless of what Gartner believes, some of our enterprise clients still run win 2k on some of their machines, and they pretty much stayed away from Vista, my guess is that it will take *some* years before Win 7 is adopted in Business space, although those that "upgraded" to Vista should have more reasons to upgrade to Win 7 than those that stayed with XP 😉, (don't get me wrong Vista is fine or even great on a decent PC, but the PC's businesses use are not on that end of the spectrum)