I have started a meetup group to explore existing and future P2P collaboration tools for organizing group efforts. It is located here
1st: We catalogue existing software tools with an eye towards some basic requirements:
No Server Required
Easy but secure encryption
Concurrent or plug-in voice and/or video handling.
File sharing support
2nd: We try some of the applications for our meetups and see what they offer and how well they work.
3rd: We draw up a set of guidelines from our observations as to what would comprise a better working application.
With insight from the above three steps and the changing world of software offerings, we then basically repeat the process over maybe incorporating some new guidelines that would aid in reaching the ultimate goal, ever better means of organizing greater numbers of people.
I have four candidate software applications lined up so far as potentially worth exploring and there are more to come.
Drop on by the web site and see if this project interests you and join up, contribute and I hope to meet you soon via our first online meetup!