Maybe I'll repost these in that stickied thread.
1. Going into an interview, you should know the background of the company you've applied for. When it was founded, its industry, public perception of it, the kinds of jobs exist within it, its major competitors, laws and policies relative to it. Displaying that type of information lets them know that you're not only well prepared, but invested in the job opportunity and staying and growing with them. It's the first question I ask, "What do you know about our company?" If you don't know anything, my automatic perception is that you just threw in an application with no idea of who you want as an employer. Or you don't care. And if you don't care, I don't want you. The more you know going in, the better because it means job training will be easier.