With the current paranoid atmosphere in the world, I would not dream of doing any street photography. An article on the local news had a photographer being stopped by the police for having a camera and being close to a school. He spent a couple of hours with them in order to prove that he was not a child pornographer. Sadly street photography belongs to a past and more innocent era. I believe that in some parts of Europe you can be sued for taking someone's picture without their permission. This also applies to their house, their dog and their livestock.

And don't even think of taking a photo if part of a government building would be in the frame!