Friendly -
Italy, Switzerland, France, and all other highly developed and peaceful EU countries (Exception : Football hooligans)
India
Japan
Vietnam/Cambodia
Indonesia to a certain extent
Malaysia to a certain extent
Egypt/Morocco
Tanzania
Maldives
Polynesia/Micronesia (Exception: Fiji in times of coup/civil war)
NZ/Australia
Turkey/Greece
Nepal
Bhutan
Israel
UNFRIENDLY
All areas with classified military activity (e.g. certain areas in China, Gaza Strip, where you might not be allowed without a press ID or permits)
All areas with coups/civil wars/full scale wars (e.g. Lebanon, Palestine)
De Wallen, Amsterdam (Do NOT take photos of the red light district, you will get your camera thrown into the canal by guys who will be twice your size)
Most of Africa, ESPECIALLY South Africa, The Congo, Sudan
SOUTH/CENTRAL AMERICA - according to me this is the single most dangerous continent to bring your camera to , the thieves are really clever and know cameras really well, no matter what you do they will know that you have a camera in there. Just stay low if you're going to places like Peru/Brazil/Colombia.. But of course if you're in a group and you keep an eye on what's happening around you, chances are that your camera will survive..
South Central Los Angeles and all similar areas in big US cities
Football matches in Europe
North Korea (You/Your guide will probably be sent to a Gulag if you get caught photographing military activities as far as i know)
-- That's all i know for now..