I readily admit that I know next to nothing about the "Emergent Chruch." All I really know for certain is that these people are trying to change the focus of the church so that it fits in with our post-modern culture.
Thankfully, Chip Bayer sheds some light on the confusion surrounding this new phenomenon. (SPOILER ALERT: The phenomenon really isn't all that new.)
Take time to read his essays on the subject: