Heuristics for History - if we're screwed, and government can't save us, what the hell good is One Big Wiki going to do?
There are excellent written summaries of each talk from Eithin, linked beside the slides for each talk. We have audio of the first talk, and video of the others. Audio quality is excellent, if occasionally a little quiet, throughout.
(Technical note: audio and video on this page is set up using HTML5+OGG. Firefox and Chrome handle this correctly. If you have to download the .ogg files to view/listen, use VLC. All tools are cross-platform and FOSS.)