We are listening to this debate in my Apologetics class. This is hailed as one of the most sucessful debates ever by a presupositional apologist. And since it took me a while to track down a copy of it on the web, I thought I would post it here for everyone.
You can download it here: Greg-Bahnsen-vs-Gordon-Stein-The-famous-debate-that-people-still-talk-about.mp3
And you can download the transcript of it here: Bahnsen_Stein_Debate_Transcript
It was held at the University of California, Irvine, in 1985.