An anonymous account of an exchange between Alvin Plantinga and Daniel Dennett is here at Prosblogion.
After Dennett's remarks, the author, who claims once to have been a "Dennettian," had this to say: "Dennett has revealed a deep wickedness in his character. I will never take him seriously as a philosopher again."
Now, I myself have been disappointed by Dennett's efforts in these kinds of exchanges, and accepting this account at face value, I'd agree that a different approach is called for in this type of forum. Even so, I see little in the account that could be shocking to a "former Dennettian." Dennett hasn't exactly been in the closet about his view that theism is a rank fantasy.
UPDATE: An mp3 of the talk is available for download here. (H/T Rob Sica.)