The scale of this problem is hard to overestimate. I estimate that people collectively spend 100 billion hours in PowerPoint annually. We're tackling the same p

The scale of this problem is hard to overestimate. I estimate that people collectively spend 100 billion hours in PowerPoint annually. We're tackling the same problem at LiveLoop (http://getliveloop.com http://getliveloop.com)... but we capture edits keystroke by keystroke so you don't have to click "sync" to see each others edits. Somewhat like Etherpad inside PowerPoint. The other big problem we've identified is participating in PowerPoint from tablets... So we have a mobile client that also lets you see presentations in keystroke-by-keystroke realtime.