Glassdoor

Glassdoor is a free jobs and career community that offers the world an inside look at jobs and companies. What sets us apart is our "employee generated content" – anonymous salaries, company reviews, interview questions, and more – all posted by employees, job seekers, and sometimes the companies themselves. Now with nearly 3 million salaries and reviews, you have all the information you might need to make your next career decision.
Plus, with Glassdoor's proprietary JobScope™ technology, job seekers have a new way to browse job listings and get instant, in-depth details for any job listing. We take job seekers beyond the information provided in your typical job description by seamlessly integrating salaries and reviews posted by employees, as well uncovering any Inside Connections™ they may have through their friends on Facebook. If our own content isn't enough information to help your with your decision, hopefully we can get you to a friend or friend-of-friend that will be able to answer your questions.
No other career or jobs site offers such detailed information about specific jobs at specific companies – all for free.

http://www.glassdoor.com