The Discovery Institute's philosopher of science Stephen Meyer discussed the topic of Intelligent Design and Evolution with astrobiologist Peter Ward (and co-author of the book Rare Earth) recently in Seattle. IDers are calling it a blowout for Meyer. You can decide for yourself by going here to listen to the exchange.
I don't know if anyone asked the question of Peter Ward, but had we been there we'd have liked to ask him what it is, exactly, that an astrobiologist studies.