What are the strongest points of the team and what are the weakest...
How do you set priorities and goals for your staff...
What is the best/worst part about working here...
How do you prefer to communicate with your staff... (personal, i.e. sit down meetings vs. impersonal, memos, etc etc... most good managers are a combination of both. Too much personal means flaky and wants to be "friends forever", too much impersonal means they don't like dealing with people.)
These questions show initiative... but also show that if you get a sh**load of negativity, it gives you a good indication that you may be working for someone who is unhappy. And we all know if the boss is unhappy, the unhappiness rolls downhill to you.