Organize Local Collaboration on a Global Scale

Ok, I'll do it... I predict... *cringe*
VoIP will be hot. There I said it. I base this simply off the fact that people like free.
Enter Bellster.

"Bellster: A P2P communications network that empowers people to share a phone line with other like-minded individuals around the world for free. Those who share access to a line, in turn, have the ability to access the lines of all of the other nodes around the world."

http://andyabramson.blogs.com/voipwatch/2005/01/what_bellster_i.html
http://ipinferno.blogspot.com/

The key is that people hate complex. That and bad slogans like:

"The love you take is equal to the love you make."

But then again... maybe it'll be catch enough to get some people involved.
At least those thinking it's some sort of new phone sex service.