I have a pre-interview luncheon with a potential employer, any advice?

This Friday, I have lunch plans with a recruiter who works for a company that is looking to hire me. We spoke on the phone the other day about my skills and current situation. He set up this meeting to speak with me more and get a better impression of who I am.

Have you ever been on one of these before? What was it like? What is some advice you could give me? Should I bring anything (resume, examples of work…)? What should I order to eat? What could I say that will definitely get him to schedule a formal interview with me? What questions should I ask? What questions will he possibly ask me?

By the way I am a computer guy and the position is for a programmer.