Windows 7 beta 64-bit version leaked just in time for Steve Ballmer's keynote

It looks like the usual suspects are at it again, showing their baldfaced contempt for copyright law by disseminating a 64-bit version of the Windows 7 beta. When we saw the 32-bit version a couple weeks ago things looked pretty good, outperforming Vista and XP in "real world" tasks, so we're hoping that its older brother performs on the same level. There's a strong possibility that the public beta will be announced at tonight's keynote, and if it is Engadget will be on hand to dish out all the gory details.