I've been doing a little studying/thinking on the Emergent movement lately (and really Postmodernism in general). Check out this helpful quote from Christian philosopher William Lane Craig:
"To assert that ‘the truth is that there is no truth’ is both self-refuting and arbitrary. For if this statement is true, it is not true, since there is no truth. So-called deconstructionism thus cannot be halted from deconstructing itself. Moreover, there is also no reason for adopting the postmodern perspective rather than, say, the outlooks of Western capitalism, male chauvinism, white racism, and so forth, since post-modernism has no more truth to it then these perspectives. Caught in this self-defeating trap, some postmodernists have been forced to the same recourse as Buddhist mystics: denying that postmodernism is really a view or position at all. But then, once again, why do they continue to write books and talk about it. They are obviously making some claims—and if not, then they literally have nothing to say and no objection to [the rational] employment of the classical canons of logic."