The legality of photographing
public spaces and places.
Here is an excellent article on this
matter with more links to more info:
http://www.usatoday.com/tech/columnist/andrewkantor/2005-12-29-camera-laws_x.htm
Basically, it states if you are in a public space and you want
to photograph anything, you may. There are a couple of restrictions,
mostly about invading someone's privacy that is not a public figure, putting
someone in a 'bad light' that is not proper, etc.. Common sense kind of
restrictions.
A primer on invasion of
privacy:
http://www.rcfp.org/photoguide/intro.html
Here is a great downloadable article on
the rights of photographers, in a PDF file:
The Photographer's Right - A Downloadable Flyer
Your Rights When You Are Stopped or Confronted for
Photography by Atty. Bert P. Krages II
http://www.krages.com/ThePhotographersRight.pdf
State by State guide:
http://www.rcfp.org/photoguide/stateindex.html