If you're looking for presentations about art and design in game industry you should visit GDC Vault web site and check latest Game Developers Conference 2010 slides. Free content can be found here.
Also you can find some slides and documents directly on authors' blogs:
Joel Burges -"Level Designer, Storyteller"
Harvey Smith, Mattias Worch - "What Happened Here? – Environmental Storytelling"
Mattias Worch - "Level Design in a Day - Best Practises From The Best in The Business"
If you found some more useful articles, please contact me and we'll publish it on Level-Design.org.