These are the slides i’ve seen so far for #wcsf 2012 through various tweets and notes. I’ll update as more slides become public, but feel free to add any that I might miss via the comments. This is just meant to be a clean, straightforward list. Thanks!
Matt Mullenweg: State Of The Word 2012
Slides: http://www.slideshare.net/photomatt/wordpress-state-of-the-word-2012
Video: http://wordpress.tv/2012/08/06/matt-mullenweg-state-of-the-word-2012/
Blog Post: http://ma.tt/2012/08/state-of-the-word-2012/
Scott Kingsley Clark: All You Can Eat Content Types
http://www.slideshare.net/sc0ttkclark/wcsf-2012-all-you-can-eat-content-types
Drew Strojny: How Not To Design A Default Theme
https://speakerdeck.com/u/drewstrojny/p/how-not-to-design-a-default-theme
Chuck Longanecker: How we used the WordPress.org platform to build, grow, scale and sell Hello Bar.
https://speakerdeck.com/u/longanecker/p/the-hello-bar-story
Paul Gibbs: State of BuddyPress
http://www.slideshare.net/DJPaul/the-state-of-buddypress-2012-13875300
Sara Cannon: Designing for The Modern Web
http://www.slideshare.net/saracannon/designing-for-the-modern-web
Andy Peatling: Mistakes I made using jQuery, and how to avoid them.
http://www.slideshare.net/apeatling/mistakes-i-made-using-jquery-and-how-to-avoid-them
Lliya Polihronov: High Performance WordPress
http://www.slideshare.net/vnsavage
Adii: The Business Of Code
https://speakerdeck.com/u/adii/p/the-business-of-code
Randy Hoyt: Custom Post Type Relationships: Subordinate Post Types
http://randyhoyt.com/wordpress/subordinate-post-types/
Kurt Payne: Foundations of Faster Plugins
http://kurtpayne.files.wordpress.com/2012/08/foundations-of-fast-plugins4.pdf
Ilya Grigorik: Measure All The Things!
http://www.igvita.com/slides/2012/wordpress-performance/#1
Isaac Keyet: State Of Mobile
http://www.slideshare.net/isaackeyet/state-of-mobile-13874063
Ryan Imel: State Of The Themes
http://speakerdeck.com/u/ryanimel
Matt Perry: Story of Ghist
http://stkywll.com/wcsf12/
I got a few links from the Goggle Docs #wcsf notes, which features some good additional information. Make sure to check that out.