Be sure to come across as nice, likable, and somone that can easily get along and work with others. After introductions and initial questions take the steering wheel and take control, not command, of the interview. Follow up with questions by giving concrete examples of past work experience. "I can actually give you a specific example related to my prior work experience in this area..."
In giving examples, don't divulge any sensitive information or information that would be considered non-public at your current employer. You want to demonstrate that you respect and will safeguard non-public information.
Get caught up with current and global events. And be prepared to be able to provide constructive opinions, original thoughts related to the trends in your field. In other words, have competent for any questions that ask for your assessment of future events/obstacles that may impact your industry/field.
Above anything else, present yourself as informed and competent.