MIX is probably kind of a UX designer developer focused conference and the largest such conference in the Microsoft world. Since its connected to Microsoft there is a bit of heavy programmer stint but there are alot of really awesome designers and ux poeple that go there and here are some of there sessions on video that you can watch.
The Laws of User Experience By Anthony Franco
Total Experience Design by Paul Dawson
Touch in Public: Multi-touch Interaction Design for Kiosks and Architectural Experiences By Jason Brush
The Art, Technology and Science of Reading by Kevin Larson
Creating Great Experiences through Collaboration by Noah Gedrich, Eric Perez, Sean Scott
Service Design Goes Social By Shelley Evenson
Total Experience: A Design Methodology for Agencies by Ben Jones, Andy Hood
Great User Experiences: Seamlessly Blending Technology and Design by Conor Brady
The Elephant in the Room by Nishant Kothary
An Hour With Bill Buxton by Bill Buxton
Windows Phone UI and Design Language by Chad Roberts, Michael Smuga, Albert Shum
Designing Bing: Heart and Science by Paul Ray
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for got one:
Windows Phone UI and Design Language
http://live.visitmix.com/MIX10/Sessions/CL14