I'll comment more later on at least some of the talks, but for now I'll refer you to conference presenter Jonathan Adler's live-blogged descriptions of the talks and Chris Mooney's summary of his initial debate presentation.
UPDATE June 7, 2006: Also check out desmogblog's coverage of the conference.
UPDATE (July 18, 2009): Looks like my only further comment was on Jonathan Adler's talk on federal environmental regulation, though I did post this on the JREF Forums on June 30, 2008:
I very much enjoyed the Skeptics Society "Environmental Wars" conference. I thought it was a good mix of long-term history on climate change (Prothero), current scientific evidence on climate change (Schneider), what to do about it from an economic perspective (Arnold), what doesn't work from a regulatory perspective (Adler), what wild and crazy mitigation techniques might be available and what they'll cost (Benford), and a little debate on politicization of science (Mooney vs. Bailey), and a couple of climate change skeptics who didn't really address any of the science presented during the conference (Crichton and Stossel). It was also a chance to see one of Paul MacCready's last public appearances before he died.
Michael Crichton and John Stossel were no Mike Reiss (Simpsons writer who gave a hilarious talk in 2005), but I still thought they provided entertainment.