Glassdoor.com

Launched into beta this month by two friends who worked together at Microsoft and Expedia-one of whom also founded Zillow.com--the Sausalito, CA-based site collects real-time reviews, ratings and salary details about specific jobs in specific companies. It operates on a give-and-take philosophy: users can view nearly 32,000 reviews and salary reports for more than 7,000 companies in 80 countries worldwide as long as they anonymously contribute a review and/or salary survey for their current employer or any position they've held within the past three years.

Robert Hohman, co-founder and CEO, says the site "makes it easier for anyone to peek inside the walls of a prospective employer--or even the next cubicle--to get information that will foster more productive conversations and lead to better career decisions."

There are already snapshots of some of the largest multinational corporations and leading commercial real estate brokerages. However, since the site is so new and data is still thin, one review can make or break a company's image. Many ratings are based on less than five reviews, so the data is still statistically unreliable.