Well, I might be going against most folks' opinions, but I don't have a problem with survailance cameras in public area's. I don't see much difference if a camera is in use, or a cop is watching from a corner, or a roof-top. I don't have any expectation of privacy while in a public area. How would I feel if a camera was pointed at my house....just fine, I'd worry less about burglary when I'm gone.
There are already many camera's being used by private security ( business ) that "cover" public sidewalks, etc. I just don't see a problem.
And, quite a few vary serious crimes have been solved due to video tape.
Mark