Be prepared as many interviewers are neither ready nor skilled at interviewing!
One interviewer had someone else's resume when he interviewed me for a job.  It took ten minutes to realize he was not talking about me.

Sell yourself don't rely on the recruiter to buy without some help.
Some employers don't understand the value of being a consultant.  I had to stress my broad experience, ability to work with different people and produce results.

Tell the employer enough to hire you but not too much so they reject you.
A good sales person stresses all the benefits and does not bring up the downside - "It's a great car but it gets bad mileage".  So don't mention you don't have an MBA unless it comes up.

Make sure you know what the interviewer wants before you make assumptions.
I interviewed for a job where I assumed that a key strength was working through layers of management.  The interviewer told me they were changing to a flatter company.

When asked if you have questions, ask questions that make you shine!
I interviewed someone and his only question was could he work from home.  I was not sold on him so I rejected him.  I wanted him to give me more input on his skills.