For some years we've been thinking about a site where cyclists could report bad motorists. Well, it's out there: PlateWire.
You can report the tag number, behavior and location and even request a postcard be sent to the offending driver for $2 (if they are able to find the address). Go here to see the Florida tags.
You're not limited to complaints. You can also flirt with drivers who catch your fancy and give attaboys to polite drivers. The one "Award" tag in Florida was a Share the Road tag!