Research as much as you can about the company - products, services, markets, competitors, trends, current activities, priorities. See the tips about researching before job interviews.

Prepare your answers for the type of questions you'll be asked, especially, be able to say why you want the job, what your strengths are, how you'd do the job, what your best achievements are.
Prepare good questions to ask, go to http://www.courseplatform.com/index.php?topic=42.0 for the rest.