1. Desperation is not attractive. When you're seeking a job, you're not asking someone to do a favor for you; you're offering the company something they want in exchange for getting something you want.
2. Be choosy and deliberative and don't just take the first thing that comes along.
3. Make your interest personal, not generic. Ask questions and express a genuine interest. Your interviewer wants to feel you want this job, not a job.
4. Use flattery. I'll admit it, when a candidate says complimentary things about the company and the interview process, I like it. I had a candidate recently tell me that the interview process itself made him more interested in working for us, because it was rigorous enough that he could tell we really cared about getting the right fit. Is there anything more attractive than someone who values the things about us that we value about ourselves? I swooned a little bit.
5. Remember to ask if you like them, not just if they like you. Sometimes people get so hung up on getting the job offer (or the next date) that they forget to assess whether it's even compatible with what they want.
6. Don't badmouth your exes. If a candidate complains about a former boss, I'll wonder if he is the problem.
7. Keep your ego in check. Be able to talk about your weaknesses in a way that shows self-awareness and humility.