Bike_Writer_Pedals_for_Protests

"New Yorker Joshua Kinberg is a bike messenger of a different stripe.
Instead of ferrying legal papers between lawyers, he uses a homemade,
wireless, bicycle-mounted dot-matrix printer to spray protest messages
in the street.
Kinberg will be taking his road-spraying bicycle to the Republican
National Convention in New York this fall, where he'll ride around
spraying slogans submitted over the Web and beamed wirelessly to the
bike."

http://www.wired.com/news/culture/0,1284,64419,00.html