I wasn't sure where to post this but I am fond of this thread and I'd like to get it back on topic.
Ideas for protesting police cameras:
1. Stage mock fights in front of them. Pretend weapons, things that look like drug deals etc - this will turn their new "tool" against them as they either begin to ignore it or, taking the staged "incidents" seriously, waste their time rushing about to resolve the non-existent issues.
2. Follow off-duties around photographing their every public moment like paparazzi and posting the least flattering examples to media/websites etc.
3. Someone else brought up destroying a camera in effigy.
4. Stand in front of them (this may require tall people or people on stilts) I know it sounds silly but might get some nice press - what are they going to do - tell you you cant stand in a public place?
5. Have signs within sight of cameras - something with police state slogans on it.
6. mount cameras across the street from police offices with a sign to the police - feel safer?
7. Insist on having public access to the cameras inside the police station.
8. Creative use of glare or light conditions, rendering the cameras useless.
This approach eschews anything that would actually damage the cameras such as spraypaint/vasoline, duct tape, long distance rifle shots or other such vandalism and would be an early step in the protest.
These are just off the top of my head - anyone else have any others?