Over 1,500 cyclists were counted last night at the San Jose Bike Party. Read the ride report and the comments over there.
There were apparently some problems -- in spite of the efforts of organizers to clean things up and encourage participants to follow the law, several cyclists were ticketed for running red lights. They've started a volunteer "Bike Information Resource Direction" (BIRD) posse, but they're looking for more ideas on how to further encourage more lawful riding and other problems.
There's another troubling development in the comments: apparently, there are now motorists throwing eggs and rocks at the Bike Party people. Several riders are responding with calls for video cameras on the rides.