+Paul Betts Silverlight is Microsoft's Flash. People dislike both for the same reasons: limited support for Linux and kinda buggy everywhere. Silverlight takes extra heat for being a Johnny-come-lately and because it was made by Microsoft. I've never had any huge problems running it on WinXP/7 or OSX, but YMMV. Can't wait to ditch both for html5.
+Paul Betts See the comments about it not working. That's a pretty good reason right? I mean you might think it's odd that the machine I use every single day all day isn't a windows machine, but that's not going to change for a couple of panoramas.
Photosynth is much more than that, Photosynth creates a 3D scene you can walk in, and it does all automatically, you just upload a lot of pictures of a place, and it creates the scene, this example is just a panoramic picture.