I just saw the friendliest “we don’t support you computer” message ever – and it came from Microsoft:

“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. Trust us, as soon as we have a Mac version ready, it will be up and available on our site.”

I’m impressed even before I’ve seen the service itself.