Here's his essay on tips for running a good unconference:
Itâ€™s easy to assume that unconferences, the popular trend in tech-sector events, require little thought on the part of session organizers. The myth is that by choosing to do an unconference, special magic will trickle down into all the sessions, blooming into dozens of beautiful flowers of enlightened communal experience...
What is an unconference? Scott points us to this wikipedia page: http://en.wikipedia.org/wiki/Unconference