You may want to invest in a nice looking planner and pen. This exudes a sense of organization and is consistent with a nice appearance. Oh, and leave your cell phone in the car. Once you've polished your appearance, save a little buffing for the conversation. Preparing for what to say in advance can help put the finishing touches on what you have to offer and can leave you feeling much more confident during an interview.
Employers look for candidates who are enthusiastic.
Be positive about your current co-workers and about yourself. And, on the flip side, show humility when talking about your own accomplishments. Teamwork is another area to emphasize. Employers need people who can work with others. Give examples of team situations in which you've excelled.