Ask HN: Questions to ask potential co-founders?

Hey everyone,

I'm a non-technical guy behind a web project. I recently mass mailed my fellow undergraduates at my (small) university and noted that I am seeking people interested in working with me at a business and/or technical level. I gave them a link to the project, which is a functional prototype. I actually received a handful of very enthusiastic replies within the first few hours.

I also noted that I was considering a search for a technical co-founder. I'll be communicating more with a couple different people today who have expressed great enough interest.

Anybody have any good suggestions for questions or specific topics of discussion while meeting with them? Of course I have a few ideas and concerns, but I'm just curious about what others would advise.

Thanks!