Ask HN: Interviewing with a startup, what questions should I ask them?

Backgound... I have been employed for a large non technology corporation for nine years. I realize I have been with them to long and for all the wrong reasons. But I'm still a little nervous about working for such a small company.

I have an interview with a startup lined up and might apply to some more. I'm sure at some point I will be given the opportunity to ask them questions about the job, etc...

So, what kind of questions should I ask about their company to feel out their stability, prospects and future?

Thanks