Wow, thanks for the thoughts, everyone! This might totally change how our company goes about its business – rather than three coders who try to think about market on the side, we'll be two coders being driven by someone actively interacting with the market and learning from it. I'll let you know how it goes 3 months out or so...
Also, see Sean's post on growth hackers here:
http://startup-marketing.com/where-are-all-the-growth-hacker...