Classics

John Resig : The Dom is a mess http://www.youtube.com/watch?v=dgI52y27O_I

Javascript, The Good Parts http://www.youtube.com/watch?v=hQVTIJBZook

Speed up your Javascript http://www.youtube.com/watch?v=mHtdZgou0qU

Brendan Eich : Fluent 2013: Brendan Eich, "JavaScript at 18: Legal to Gamble" http://www.youtube.com/watch?v=qrf9ONmtXbM&list=PLbzmrLqsBB4...

Paul Irish : 10 things I learned from the Jquery source http://www.youtube.com/watch?v=i_qE1iAmjFg&list=PLnKbkxvOAna...

Less known but very interesting

Building High-Performing JavaScript for Modern Engines http://channel9.msdn.com/Events/Build/2012/4-000