Bruce Schneier, security expert extraordinaire and columnist for various newspapers, had a nice article in The Guardian (and his blog) about the current tendency to restict people taking photographies.
This is not only happening in the US or the UK, where private security companies hassle people who are taking pictures in sites where it is perfectly legal to do so. This also happens in Switzerland, which is not necessarily known to be a hardcore paranoid in the war on terrorism.
In Schneier's article and the comments are a couple of links on your rights as a photographer and on what is legal to photgraph and to publish:
There is a nice comment in this article, which not only applies to the US unfortunately:
We keep being told something along the lines of "terrorists hate us because of our freedom". So Dumbya had a cunning plan.............
If we no longer have freedoms, they will no longer hate us.