What is the Emerging Church and why is there a new podcast about it?

Doug Pagitt talks with Tony Jones and Tripp Fuller about the new podcast they have produced:
Emerged - An Oral History Of The Emerging Church.
What is, or maybe it needs to be asked, what was, the Emerging Church movement?

From the early 1990's through the mid-2000's there was an exciting movement in Christianity that is often called the Emerging Church movement. What was it, where is it now, and how do all this happen are three questions at the center of the the new podcast Emerged. 

Emerged is a Homebrewed Christianity production.