C++ and Beyond 2011, "Adventures in Perfect Forwarding." Judging by the dates on the comments below the video, it's been available since July, but I found out about it being online only today. (Apparently I don't have enough friends.)
The video is broken into two parts, each about 30 minutes long:
Facebook does not appear to have made the presentation materials available, but you can grab them here (PDF).
I hope you enjoy this talk.