I was just thinking the other day how the web is the perfect place to build communities. Eventful Demand is a website that allows fans to start a 'demand' for their favorite artist to come to their city and perform. Clearly this is intended for under-served markets, but is a nice tool for music enthusiasts who are normally at the mercy of bookings. I know fans certainly clamor on band sites for their shows, but ED really shows the collective power of critical mass being utilized by the web. Apparently booking agents have been keeping an eye on this consumer-powered community to see if maybe they should add or change tour stops for their artists. Great idea here.