Be positive, confident and professional.  Know where you are going.  Arrive 10-15 minutes early.  If necessary, drive to the location a couple of days before the interview so that you know where you are going, where to park, and how much time  to allow to arrive on time.
 

Dark Suit, white shirt, conservative tie for men; black or navy suit for ladies.
Keep your jewelry to a minimum.
Look like a winner!
 

Keep it in a folder, so that it is fresh. No messy copies from your pocket or purse.
 

NO BLANKS.  There's a reason you fill out an application even though your resume' has most of the required information on it.
 

Research the company.  Visit the company website or get information from your local library and be informed.
Be prepared to discuss your goals.  What makes you more qualified that other candidates.  Emphasize your strengths.  Focus on what you are;  not on what you may lack for that particular job.
 

Turn off cell phones!  Maintain eye contact throughout the interview.  Pay attention.  If you don't understand something, ask for clarification.  Take notes.
 

Prepare a list of questions.  Ask questions about the position and the company.
Do not ask about salary or benefits.  At the appropriate time the interviewer will reveal that information.
 

If you are interested in the opportunity, let the interviewer know.
 

Send a handwritten note in the mail.  Or, if time is of the essence, email a thank you.