As it is, if you use 'photosynth' in your query as well as a few words from the synth's title, search engines do a pretty great job of pulling up the synth and you can see they know what the title is, etc.
Here's a sample query for one of my synths:
In Bing: http://www.bing.com/search?q=photosynth+orbital+propulsion
In Google: http://www.google.com/#hl=en&biw=1659&bih=921&q=photosynth+orbital+propulsion&fp=d57fa4d55e4b4d9a
I suspect if you're having trouble seeing your panos in search results, it's only because they're so new - at most a week and a half old. Search engines sometimes only refresh their cache of a page every two weeks. If, after New Years Day, you still aren't seeing good results for your synths or panos, then perhaps something should change, though I don't know that it will be the URLs.
I see you've added tags on most of your work so far, so that should help with SEO, as should the geotag, I would think.