Visit the Company Website
Visit the company website, review the company mission statement and company history, products and services, management, as well as information about the company culture. The information is usually available in the About Us section of the site.
LinkedIn company profiles are a good way to find, at glance, more information on a company you're interested in. You'll be able see your connections at the company, new hires, promotions, jobs posted, related companies, and company statistics. Take a look at your interviewer's profile to get insight into their job and their background.
Get an Interview Edge
Glassdoor's Interview Questions and Reviews section has a goldmine of information for job seekers. You can find out what candidates for the positions you are interviewing for were asked and get advice on how tough the interview was.