Terapixel before and after
Microsoft Research used something called Terapixel to take individual images and combine them into a seamless sky view.
Image used with permission from Microsoft. Caption by Wally Bahny.
The site looked like a dog's breakfast in Firefox, but also had to use the "Compatibility View" in in IE8 for the same reason.... are you kidding me??
"WorldWide Telescope is a new project from Microsoft Research" I don't mean to undermine your story, but this is not a new application at all. I have been using this for at least a year already if not 2 years or more. none the less it is an awesome application and does deserve recognition. I just hope that there's not a sudden influx of users that ends up slowing down the servers.
I'm a Windows user, but have to admit Linux/Unix are the dominant force in the science community, followed by Windows (too often XP!).
I first saw WWT demo'ed by Microsoft guys using a Mac. The message was clear -- WWT is built to run on many platforms. It can be used in a small (or large) school planetarium, or on your desktop. There are numerous scientists already using it!
Regarding both of the above posts - what scientists would be using this? It's a pretty-picture results display, not a form or framework for usable data.