I love spending time in cities doing street photography. I've enjoyed and learned much watching the 2 videos Scott Kelby made with Jay Maisel. They can be found at Kelby Training.
Now here is a free, yes free, 96 page ebook written by Thomas Leuthard that will blow you away. It's an "Everything you wanted to know" book. Not only that, but his photos are fantastic. You can find it here.