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"
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)