They sum it up rather neatly:
200,000 people have written to their MP for the first time, over 8,000 potholes and other broken things have been fixed, nearly 9,000,000 signatures have been left on petitions to the Prime Minister...
Fixmystreet, one of their best projects, is simple and effective. You leave your complaint, the council deals with it, and MySociety logs their success (or failure). I can, for instance, see that 100 metres from my front door somebody has reported a badly lit alley, and the council has promised to fix it.
