Here's a story in Wired Magazine about city bikes:
Some people believe that, right now, a quiet revolution is taking place. In cities like London, San Francisco, Boston and New York, the ranks of bicycle riders are swelling with the rise of a new breed: the urban biker.
Traffic snarls, soaring gas prices and worries about global warming have prompted a big boost in cycling, affecting even places like Los Angeles -- America's freeway capital -- that have traditionally given bicycles the cold shoulder.
"What's really happened in the past year is a cultural shift...."