Though be careful not to confuse "business head" with "a person capable of adding a business model to a solution and bringing revenue from 0 to 10m within 2 months". Depending on your idea, I've seen CS Ph.D. students take on board a former management consultant with 2-3 years of work experience as CFO. (data integration solution that sells to corporate customers) His motivation? Less hot air, more opportunity to advance an actual project.

Alastair, if you're talking about Taxonomy - really liked your custom maps blog post, btw, even though I'm not a tech guy myself -, someone at college might be well-suited, as you seem to be working on a solution that needs larger-scale consumer adoption and an interesting story to sell (PR-wise) in order to be successful. I am always amazed at the number of business students I know (of) that are happy to intern at (commercial) startups or company builders and end up "community managing" the Facebook page, just because the business founders are successful at pitching their Groupon clone. If you give a talk at a university etc. and mention you welcome feedback on which feature is missing (>> ask for advice, you get money; ask for money, you get advice) afterwards, you might just find someone with a good product sense that also doesn't mind approaching people, and spare them that fate.