As far as I can tell, you actually haven't created any photosynths. What you captured and uploaded with the mobile app are panoramas - panos, for short.
There is HTML embed code for individual photosynths or panoramas available directly under the synth/pano viewer when you're viewing one on a laptop or desktop computer.
A photosynth is different to a panorama because whereas a panorama is the view from one position only, a photosynth is many different photos taken from multiple positions all linked together in a 3D slideshow.
Unfortunately, Photosynth's website does not yet provide linking panoramas together into a synth. You can only use normal photos to link together in a synth.
A slideshow of your panoramas is a great idea, however there isn't yet a way to do that on the site.
One way to make it interesting is if your panos are all geotagged. That way a third party developer could make an embed that swoops from pano to pano on Bing Maps.