Glassdoor, a Sausalito, Calif.-based startup in stealth mode, has raised $3 million in a second funding round led by Benchmark Capital.

The company’s site has little to say about its plans, except that it will have “something live in mid-2008.” I called a Benchmark representative, but she was mum as well. PEHub says Glassdoor is a social networking  company focused on employment conditions.

The company is led by chief executive Robert Hohman, formerly president of Hotwire.com and engineering team leader at Expedia.com,  and Board Chairman Richard Barton, who is also chief executive at real estate site Zillow.