I've come across a wonderful website called Roadwitch. It's about DIY traffic calming - people in a quiet residential street got fed up with traffic speeding dangerously along the road, and fed up waiting for the local authority to do something about it, so they took matters into their own hands in a creative, whimsical, and very effective way. For example, they set up a living room in the street which created a physical barrier to fast-moving traffic and a psychological reminder that the street is there primarily for people to live in, not primarily for cars to race along.
I love this. I sympathise deeply with the people v. cars dimension. I love the "power to the people" element. And the humour and whimsy of it is also very appealing.