Did the leaves fall off? Something not working right? Let us know how we can improve the Photosynth experience.
The Photosynth Web Site uses Microsoft Silverlight for its viewer and editor. Silverlight works across operating systems and across browsers, but the latest version of Silverlight (SL5) does NOT work properly in Chrome on the Macintosh. Here's the support matrix: http://www.microsoft.com/getsilverlight/get-started/install/default.aspx (see System Reqs).
The main problem that Photosynth users will see when using Chrome on Mac OS X is that entering text in the Photosynth editor does not work. That's a serious problem.
The short term workaround is to use Safari or Firefox rather than Chrome on the Mac. Silverlight does support these browsers on the Mac.
The longer term fix is for us to move more of our funtionality to HTML5, which is a project we are working on. We're starting with the panorama viewer, and will eventually get to the editor. Until then, I'm sorry to say that your browser choice on the Mac will be reduced.
For months now I've not had any success with Photosynth's Silverlight viewer actually viewing any photos in Safari on an iMac with Silverlight 5 installed.
Firefox seems to function okay for viewing, although the viewer takes much longer to load than on Windows.
Chrome actually views synths alright, even if you can't input text in the editor and it takes longer than it ought to load the viewer, so Mac users take note.
Just as a comment, Chrome on MacOS will allow you to paste text into textboxes in Silverlight so it's possible to type what you want in the address bar, copy it, and then paste it into the Silverlight editor form.