's website and look at his CGI tutorial. He's a fanatic when it comes to security, and has even made someone as uncaring as me care a little. Of course, he's unintentionally planted some cracker ideas in my head, too ;). But his course is a good read and deals a lot with security.
Don't worry about people stealing your ideas. If your ideas are any good, you'll have to ram them down people's throats.