The Mix sessions are available on-line here.  For Silverlight sessions, I’d recommend starting with the following:

V 1.0 Sessions:

·         Celso Gomes: Building Rich Web Experience with Silverlight and Microsoft Expression Studio for Designers

·         Mike Harsh: Deep Dive on Silverlight Media Integration

·         Brad Abrams, Chris Knowlton, James Clarke: Creating and Delivering Rich Media and Video on the Web with Silverlight, Microsoft Expression Studio, and Windows Server Codename "Longhorn"

·         Joe Stegman: Building Rich Web Experiences Using Silverlight and JavaScript for Developers

V 2.0 Sessions:

·         Jamie Cool: Building Silverlight Applications Using .NET (Part 1 of 2)

·         Jamie Cool, Nick Kramer: Building Silverlight Applications Using .NET (Part 2 of 2)