Sure you already know that you need to dress to impress and bring a copy of your resume when you're hoping to have a good job interview, but there is a lot more to impress a potential employer that those simple strategies. For example, be aware of the most common job interviews and know how to answer them.
Also, really examine the job listing and determine how your skill set can help you succeed in the specific position you are applying for. Whatever you do, try to be confident, but if you are nervous breath slowly to yourself as calm as possible and keep your hands open so you won't get sweaty palms when you shake hands.
Remember, properly preparing yourself, it's easy to make any job interview a good interview.