I'm a big fan of the Photographer's Rights PDF. I carry a copy around in my camera bag at all times, and tell all photogs that I know about it. If you're going to photograph in today's security conscious society, you have to know what you can and can't shoot. I've just come across the UK version of this leaflet which is important as the laws in this regard are drastically different between the two countries. Link below:UK photographer's rights
The Photographer's Right: UK Style
heads up: this is a pretty old post, it may be outdated.