Yeah, I agree that Photosynth atm isn’t ready for mainstream use (big plugin size, not much penetration) – that’s why I suggested it would be good on-gallery.

Just had a quick poke around thinking there might be a converter from Photosynth (and now Silverlight, I see on my Mac..) to Flash. There isn’t such a thing and not knowing much about the underlying technology, may never be.

A Flash stitcher would be nice. This would obviously not be exactly Open Source, but with big enough penetration to make that immaterial (IMO, anyway..)