I love Fog Creek and use Trello daily. I'm your target audience. If you could make this self-hosted i.e. on my own company's intranet secure servers, I would pay a lot for it.
It could serve as a great educational tool too. Something that would allow people who are overwhelmed to get their feet wet and 'build something functional'. Getting 'hello world' to print on a console is cool, but it won't excite someone as much as getting a live website to print 'hello world'.