I participated in the closing panel at Supernova with Mary Hodder and Suw Charman: a chat about the backchannel that was as chaotic as a backchannel. Technical difficulties provided a disarming tension at first and kept us from showing a video Mary made. Here's the posted version, unfortunately the funniest part was edited out for mature audiences. Suw posted her notes here. At one point, I ran through the silliest powerpoint I could come up with.
Despite my best attempts, Rohit said it was the best panel of the conference, which had little to do with the panelists and much to do with participation.