This was a talk on Stackless Python by Christian Tismer. Unfortunately, Christian recently suffered from a stroke, so his speech was quiet and slurred. Let's hope he recovers quickly! The difficult subject matter, a strong accent, his slurred speech, and his tendency to talk about minor technical details rather than what he was trying to accomplish compounded to make the talk nearly impenetrable. I understood what he was saying most of the time, as did most of the stackless people, probably. However, as evidenced by the lack of questions, I doubt very many other people did.
One thing I did grasp, however, was that PyPy makes implementing stackless easier.