This post is more than 2 years old.
I'm posting this mainly as a reminder to myself on things I need to check, but here are two very large lists of front-end presentations that you may want to check out.
First - a YouTube list of videos from the HTML5 Developer Conference in October of 2012. This is over 20 hours of videos - free.
Note - this includes the "Broken Promises" talk I raved about a few weeks back.
Next is a great article in Smashing Magazine from Addy Osmani: Talks To Help You Become A Better Front-End Engineer In 2013. This is a list of nearly 40 presentations nicely split into sensible categories.