All those cool kids with their messy hair and loud rock music like to talk about how Vista is the "end of an era," and from now on the OS will move towards modular updates and internet service-based functionality. But before they get too smug, Steve Ballmer warned on Monday that there's "plenty more where that came from." He sort of dodged the questions about when to expect a service pack, saying "We'll put one out if we need to," but he also mentioned "We've got a very long list of stuff our engineers want to do, a long list of stuff all of the companies here want us to do," and that "There are so many areas where we need innovation." Hard to really tell what he's hinting at -- other than the fact that he obviously wants you to buy his shiny new OS -- but while Fiji does seem destined for our desktops sooner rather than later, it's hard to discount rumors of the tantalizing upgrades and reworkings we're hearing about in Vienna, which would be Microsoft's first big break in Windows backwards compatibility, and could provide much more power to the OS. 'Cause you know how we do: we're doing our Flip 3D thing, tagging our photos and burning those DVDs, and we can't help but wonder, "is this all there is?"