Interviewing for a new job needs to be looked at first as more of an interactive exchange than a daunting and sometimes anxiety-producing evaluation of ones' abilities relative to the requirements of the position being interviewed for. Approach an interview for a new job as more of a conversation, or exchange of not only the specifics of your background, but of how you perceive the company, the industry it competes in, the culture of the company, and what expectations there are for the position. Realize that you are valuable to the employer as well; that is why they invited you to an interview in the first place, so be confident during the interview process.
             The most important time you'll spend however is not in the interview itself. It's beforehand. Study the companies thoroughly, get a binder started just dedicated to the company and its industry. Scour the Internet using Google to find out as much as you can. If the company is publicly-traded be sure to look at their financial statements, know if they are profitable or not, and if not, why. You don't want to join a company losing money, so this is a critical step in your preparation. If you really want to see what's going on in the company go to the Securities and Exchange Commission website and get their latest statements downloaded. Read them over. In these documents you'll find out what the strengths and weaknesses of the company are, what challenges it is facing and why, and what the industry is doing they compete in. Keep drilling into the company as much as you can; become an expert on it. Also be sure to look at how your specific department you are interviewing for is doing. Ask around on sites like Vault.com and scour this site for company and industry information as well. If you're really ambitious and you really want the job, start collecting the information into a plan for the first 90 days on the job, and present it t...