The Voices of the ElePHPant podcast has published their most recent episode today, another in their series of PHP community interviews. The time it's with Jeff Carouth, a leader in the DCPHP user group.
They talk some about the idea of "open spaces" at conferences and how it can make it easier for people to present their ideas without having a full presentation. He also mentions the "hallway track" at events and some of his experiences at HTML5 Texas. He also explains what he sees as the difference between an unconference and the "open spaces" area.