Mike15 -
There are quite a few general resources on the internet and even in this forum if you do a concentrated search for interview prep. In my experience with undergrad, i-banking and my mba interviews there really is no secret sauce.
My advice is to make sure you are intimately familiar with all the details in your application and essays. Be prepared to talk about what you wrote. Research the university itself and talk about why it would fit with you and your personal decision to pursue this degree. Also be prepared to talk about the weakest parts of your application. Finally, have some anecdotes from your professional career that showcase your talent and speak to how an MBA would make an impact in your life.