Gregory Waldorf, the CEO of eHarmony.com, has a great idea for how to judge a company’s culture during an interview. In order to judge whether they’ll be good people to work he recommends asking:
"What happened to the people that had this job before me?"
If they know, if they can tell you where they are working now, what they are up to, etc, then that means they had a good relationship. If they don’t have a clue, well, it might mean that they won’t have a clue about you when you leave.