[petek]

Mostly it's basic How to Make Friends and Influence People stuff:

Show up 5 - 15 min early, but not earlier and absolutely not late;
Remember to breathe;
Make eye contact;
Enunciate;
Repeat the other person's name when you meet ("Glad to meet you Fred");
Listen well. Avoid interrupting - a person who mostly listens will make a better impression than one who talks alot;
Ask questions - even "dumb" ones (no such thing, yada) show you're interested;
Make sure you get your interviewer(s) contact info before you leave ("May I call you if I have any questions?", "May I have your business card?"), and then be sure to send a note of thanks to your main contact, and also to any others who seemed to take interest in you. These days email is accepted, but I still like to send a snail mail followup to the main contact;

Good luck!