To me, the power here is in using the technology to foster local, human-scale interaction.
Intranets are totally underutilized. How many people do you know who can reliably transfer personal files over a local area network? Not nearly as many as those who know how to use google or send an email... that's absurd to me, given how ancient of an application file sharing is.
It's my opinion that the survival of the internet may very well rest on p2p webs like this.