I think it's a real problem. How, as a developer, can I find someone who really is a business person, and not just someone who isn't technical. You see, there are a lot of non-technical people interested, but not as many people who are actually proficient. Business people is such a generic term. What aspect of business is someone good at?
Maybe that's an issue with what I'm looking for. Not a business person. A "business person" is like asking for a "developer." I mean, really, what is a "business person." It's like labeling myself as a "developer." What does that tell you?
Absolutely nothing useful.
Beyond those business skills, you'd likely want the usual requirements of any co-founder: integrity, and a record of getting things done.