I wonder why this haven't been posted here, since it's a pretty interesting talk. Ok it's actually not directly game-dev related but still quite worth the watch. Especially when he starts to talk about User-created content distribution.
[ame="
http://www.youtube.com/watch?v=t8QEOBgLBQU"]Gabe Newell: Reflections of a Video Game Maker - YouTube[/ame]
HATS!
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[ame="