The men in question had a debate recently, though the video isn't up yet. It's probably a little more interesting than a lot of other Dennett debates/discussion because they're both Atheist, who disagree fundamentally.
Brown has written an article in the Guardian referencing points in the debate.
http://www.guardian.co.uk/commentisfree/andrewbrown/2013/may/27/im-an-atheist-wont-try-deconvert-anyone
What separates Dennett from Brown in seems to be that while Dennett feels that people are generally better off as rational atheists, Brown's argument can be summarized by this quote
[..] atheism is medicine too strong for most people
Thoughts?