I have to agree with Steve's comment that "It's a mutual meeting to determine if we want to do business together" for it is indeed a partnership. Too often the interview devolves into a scenario where everyone's only looking out for their own interests: the company is checking to make sure that you're at least capable of doing the job and the potential employee is checking to see what salary and benefits they get. Instead, by doing your research ahead of time and by asking appropriate questions, you can propose areas where your skill sets would benefit the company beyond their initial expectations. That makes you a more valuable potential asset and therefore the company will be more willing not only to extend an offer to you but perhaps to also sweeten the pot with additional bonuses (monetary and non-monetary). Also, don't overlook the value of non-monetary benefits either as some of them (fitness center, daycare, etc.) can be quite valuable.

I investigate the company and pursue the interview as though we are going into business together. As Steve mentioned, "you will spend a lot of your life in a job." It's not like picking a new place to do your grocery shopping! Take time and effort to do your research, prepare for the interview with polite, candid questions, and take notes during the interview. Not only will you benefit from this, but you will impress those in the interview as well. After all, you and the company will be joined at the hip for the bulk of your day for quite some time. Doesn't it make sense to choose wisely?