1) Dress a little better than you think you should
2) Polish your shoes
3) Be there 10 minutes early
4) Eye contact, firm handshake and a natural but confident greeting
5) Be prepared to draw examples from every little job, volunteer work, team project for school, etc. that might put your candidacy in a better light
6) Think of five top achievements/situations/developmental opportunities, etc. you have experienced that speak well about you and find a way to work these into the conversation
7) Emphasize your accomplishments in the context of a team environment
8) Being able to talk about your successes is nice, but being able to convey how you helped a team or other individual succeed is even better
9) Enthusiasm helps, but don't be ashamed to say that this is the job you really want (and be prepared to back it up in a couple of bullet points)
10) If some question catches you off guard don't get flustered or ramble hoping to say something positive. Keep your composure and be prepared to say something like "I haven't had an opportunity to be in that type of situation" or "I'm looking forward to that type of challenge" or "It didn't work out like I had hoped, but it was a learning experience" or something like that.
11) Do a lot of homework about the company. Read everything you can about them and be prepared to talk about their strategy, new products, competitors, challenges to the industry. There are very few things you can control, but you can always control how well prepared you are in this respect.
12) Have a couple of questions you want to ask about the company, department, role you are being considered for, etc. and if you can couch these in the context of some research you have done for #11, all the better
13) Be professional, friendly, composed and confident
14) Try to come across as someone who is always prepared and thinks well on his/her feet
15) End with the same firm handshake and friendly/confident manner that you start with and something like "I'm looking forward to this opportunity"