Best advice is prepare, prepare, prepare. Stay focused on the interview and communication skills. Be ready with examples to support the experience listed on your resume. Put the interviewer at ease--remember, they're uncomfortable too so getting them to think of this as a conversation is important. You want the interviewer to walk away thinking, "I'd really like to work with that person". Make a list of questions and make sure you don't forget that you're there to interview them as well. Also key...understand what sets you apart from your competition. Why you?