=) Sometimes it feels like every topic, but I try to be quiet whenever I don't know where a specific answer is. I suppose I answer in case no one else does.
Several Photosynth team members post here, some more frequently than others as their small team is responsible for creating new features, maintaining the website, fixing bugs in the synther, viewer, and website, providing their own customer service, as well as publicity via the Photosynth blog and the forums. Pretty exhausting responsibilities for what is not a massive team!
I don't have a full list anywhere, but TonyErnst is probably the most active these days. Others include: adam_mitchell55, AdamSynth, Bert, Blaise, David, Douglas, Drew, Gfxblit, Greg, HouDan, Jonathan, Joshua, K, KevinH, MaDeeds, Marvin, Nathan, Peter, Scott, Shail.
Other interesting people (although not strictly on the Photosynth team in an 'answer your questions' sort of way) include: Noah, Rick, GWF, BillCrow, Don, + Lutz.