Arik Poznanski has a few blog post with pictures reporting the 
MIX11 sessions he attended:
- MIX 2011: Advanced Feature in Silverlight 5
- MIX 2011: Enhanced Push Notifications and Live Tiles for Windows Phone
- MIX 2011: Interactive Panel: Kinect and Natural User Interfaces
- MIX 2011: Mono: State of the Union
- MIX 2011: Sensor and Camera Access in the Next Version of Windows Phone
- MIX 2011: Back to Square One
- MIX 2011: Graphics and 3D with Silverlight 5
- MIX 2011: What’s New in the Windows Phone Developer Tools
- MIX 2011: Get Ready for Fast Application Switching in Windows Phone
- MIX 2011: Building In Browser Experiences with Silverlight 5
- MIX 2011: Java-Script – The Language
- MIX 2011: Deep Dive MVVM