Over prepare. An interview IS the ultimate sales call. YOU’RE the product! You not only need to understand your product, you must understand the employer's needs. Prepare a T-account on yourself and the opportunity AND then overlay it on the company’s competitors as well as the industry. Position yourself relative to the industry not just the company you are interviewing with.
Compliments of David E Perry and Kevin Donlin. For more creative job search tactics, go to the Guerrilla Marketing for job hunters blog and download the free audio CD.