This is Critical Mass. This is Green 2.0. This is the last friday of every month. This time, it is September 26th. This is everyone, and their cool older brother, on a bike, or some other form of self-powered wheeled transportation (Matt claims he saw a longboarder once), riding throughout the San Diego streets.
There is no automobile. There is no gasoline. There is a myspace page. There is a generic info page, hosted by UCSD. There are all kinds of flickr images. There is good times had by all. There is a YouTube clip of a news broadcast on the July Critical Mass:
Bring your bike! Bring your green hat!