What to Bring
You now know how to prepare for the interview and what to wear, but there is still the question of what to bring with you. While you don't want to show up with a briefcase that's bursting at the seams, you don't want to show up empty-handed either. At the bare minimum you should bring a pen and a notepad to an interview. This will show that you're interested in making notes about what you learn, and it will allow you to jot down any items of importance, such as your interviewer's phone number. A slim briefcase or a leather-bound folder (containing extra, unfolded copies of your resume) will help complete the look of professionalism.
Sometimes the interviewer will be running behind schedule. Don't be upset — be sympathetic. Recruiters are often under pressure to interview a lot of candidates to quickly fill a demanding position. Come to your interview with some reading material to keep yourself occupied and relaxed while you wait. A good choice would be a trade journal or a book about your field; this will show your interest in the job and keep your brain on topic.