Select appropriate interview attire. Dress the part by showing up to the interview in professional clothing and recently shined shoes. Keep hair color and accessories conservative.
Time your drive to the interview location so that you arrive 10 minutes early. If you are traveling during rush hour, arrive 30 minutes early and then drive to a nearby coffee shop or grocery store to assure you will hit your 10 minute early deadline.
Silence all cell phones and pagers and leave them in an area where they can not be seen. Even a phone on vibrate can be heard and may be distracting to both you and the interviewer.
Don't show up empty-handed. Bring a briefcase, binder or day planner with notepad. Use it as a place to keep those extra resumes and for taking notes. Also, have your predetermined questions written here and pull them out when it is your turn to ask the questions.
Be professional to everyone you come in contact with at the interview location. Being rude or unprofessional while waiting for the interviewer may get reported back by a receptionist, security guard or other employee.
Answer the interviewer's questions, staying away from giving any personal information unless asked, and even then, keep it very brief.
Use appropriate language throughout the entire interview. Do not use slang or swear, even if the interviewer himself does.