One of the best videos about game creation from Mark Cerny. Must watch.
GDC lecture from Jason VandenBerghe about game design when you have a lot of constraints.
GDC lecture from Richard Carrillo about different game designer types and how to build balanced design teams.
GDC lecture from Patrick Plourde with a lot of useful information about Ubisoft game design approach on Assassin’s Creed 2.
GDC lecture from Alex Parizeau about teamwork in big teams.
Video about Naughty Dog production culture and working environment from Richard Lemarchand.
Uncharted 2 post-mortem from Richard Lemarchand with a lot of knowledge about Naughty Dog approach to game design.
GDC lecture from Benson Russell about Naughty Dog approach to game polishing.
GDC lecture from Rob Pardo about Blizzard game design principles.
GDC lecture from Jay Wilsong with Diablo III post-mortem and explaining of the Core Pillars concept.
GDC lecture from Eric Dodds about Blizzard approach to game design in Hearthstone.