http://www.microsoft.com/downloads/details.aspx?FamilyID=42f2f862-9987-406c-92a3-6523cf0eb3b3&displaylang=en

 This SDK enables you to develop Windows SideShow gadgets by using managed code. We've included a C# and a VB project template, along with a wizard component, to make getting started super easy.

 In upcoming blog entries, I'll write a bit about my experiences in helping to put this release together.