The HOPE conference is a biannual hacker conference that dates back to 1994. It is associated with the 2600 Hacker Quarterly magazine. The latest HOPE conference, A New HOPE, occurred last month (July 22-24). The organizers recorded all the presentations and posted them on their YouTube channel (Channel2600).
You can check out the playlist here.
These conference talks (and for that matter the magazine) never disappoint.