We'll be stuck for a while
My place of work just upgraded to XP less than a year ago (yeah, scarey, I know). Until last month we were getting rid of IE6 through attrition, but someone finally convinced the powers that be that it was time to ditch it. To my knowledge I'm the only one here running IE8, and that's only for testing websites. Frankly I don't expect to see Windows 7 here for another 5 years or so at least....Probably about the time Windows 9 is coming out.
Incidently, in response to a couple of anonymous cowards who posted earlier:
1) IE6 is FAR from the most common IE out there now. It accounts for about 20% of our traffic, compared to 51% for IE7. Granted you're not going to find our website on a top 100,000 sites list, but we get diverse enough traffic that I think that's probably a fair reflection of what's out there.
2) Speaking as a Linux geek, I don't fear Windows 7. I still wouldn't willingly use it, but I gladly recommend it to others. A lot of the GUI features that everyone seems to love in it just drive me nuts. Isn't personal preference great? And what's with the Microsoft ad anyway? Seriously you sound like a TV commercial.