My friend JonathanS pointed this out to me.
Photosynth, Microsoft’s new project which allows you to map out 3D space simply by putting together pictures.
When I went to the website (www.photosynth.net), I clicked one of the “synths”. I got this message:
Unfortunately, we’re not cool enough to run on your OS yet. We really wish we had a version of Photosynth that worked cross platform, but for now it only runs on Windows.
I was running Firefox 3.1a2pre (i built it from hg!) on Mac OS X Leopard.
I also spoofed as Firefox 3.0 on Linux and it says the exact same thing.