This is from a few days ago, but worth noting. It brings up an interesting hypothetical: you're walking along, you see an arrest, you take a picture. Now, if a police officer tells you to stop, you stop. But what if, instead, they insist you give them the camera?
Man jailed in photo incident awarded $8,000
"An amateur photographer who was taken into custody last year after shooting pictures of two Seattle police officers making an arrest on a public street received an $8,000 settlement this week, the American Civil Liberties Union of Washington announced Thursday."