Links to DEF CON 19 presentations:

RSS Feeds:
https://www.defcon.org/podcast/defcon-19-materials.rss - Speaker materials
https://www.defcon.org/podcast/defcon-19-slides.rss - Slides Video
https://www.defcon.org/podcast/defcon-19-video.rss - Video
https://www.defcon.org/podcast/defcon-19-audio.rss - Audio Book format audio

Also don't forget to check out https://media.defcon.org/ for links to everything!