Peter, have you used this tool? If so, in what context? I'm looking for a group collaboration space for a new cohort of grantees at my organization, and this looks so simple and all-inclusive...too good to be true, it seems!
Love that one. Also, Titan Pad at http://www.titanpad.com accomplishes all the same things, but with a few less bells and whistles to distract students.
Interesting presentation tool that allows for more dynamic, social content, analytics, etc. Maybe an option for an entire website? Also real-time meeting feature.