If you’re curious to know what NWA employees have to say about the airline behemoth, or whether Best Buy really turns on the fun, or who’s firing on Target today, Glassdoor.com is just for you. The website lets employees air their grievances, or in some cases, their mega-corporation make-out sessions in the form of high approval ratings and acclamations.

For major Minnesota companies, so far only one gets glowing reviews: Employees at General Mills seem pleased as punch about the company culture and CEO Ken Powell. The local company with the worst employee-approval rating? That would be United Health, where CEO Steve Hemsley has a positively Bushian approval rating of 18 percent.

Signing up for Glassdoor isn’t easy. Anyone who wants access to the site’s info has to fill out a questionnaire about their employer. There are questions about benefits, compensation, "knowledge sharing," and senior management competency. This requirement–really, like a glass door–ensures only those truly interested in sharing their feelings will get through, which also means many corporations will get a "neutral" approval rating as the lovers and loathers balance each other out.

But less interesting than the median rankings are the employee experiences. Given the serious issues facing UnitedHealth, it’s no wonder employees there have chimed in with negative responses like "you can’t con a con when it comes to internal fraud." We’re not quite sure what that means either, but we’re pretty that there’s a clear consensus that UnitedHealth’s own employee health benefits actually suck. The experience as an employee, it would seem, is not all that different from having UnitedHealth as an HMO.

Glassdoor.com, a start-up from web big players at Hotwire and Zillow, is still in its infancy as the beta version, and doesn’t quite have enough employee feedback to make it a clearing house of inside-corporatedom. But if it works, it could offer a lens into corporate culture and create an at least semi-transparency that is often shielded by corporate PR. If the creators can ensure that company mouthpieces aren’t creating numerous profiles, the site could end up being beneficial to job seekers and those looking for more corporate accountability.

Of course, given the amount of security and firewalls and fear rattling the cubes of many corporations, Glassdoor.com will undoubtedly be blocked from some workplace computers. A couple of years ago, for example, employees at Best Buy headquarters were unable to access BestBuySux.org, a site created by an unhappy former employee that was to be a central forum for customer and employee complaints. Today, the site is now a giant ad for Best Buy. Employees at Target headquarters are not allowed access TargetSucks.org, which also is a site dedicated to discussing bad service and employment horror stories. These days, as corporate PR campaigns rely on being just as shiny on the inside as they are on the outside, you have to use your BlackBerry–in the bathroom and on your break–if you don’t have anything nice to say.