Been helping out with Tom Steinberg's MySociety.org project.

Think of it as Venture Capital for Social Capital on the net. Stef got keen on this idea a while ago in a fit of frustration, and James Crabtree wrote up a similar notion here

Much respect to Tom Steinberg for Actually Getting It Going though - in this world coming up with great ideas seems the less problem - it's getting them built right that seems to be the limiting factor.