I just  ran into Ted Glaza from Ajax Control toolkit and Silverlight Controls fame and he is getting some of the control developers together (3rd parties, Microsoft as well as in house) to talk about building controls for WPF and Silverlight. 

We will have some folks there are are building the current set of controls that ship in the box for Silverlight and WPF from and I hope some folks from Telerik, ComponentOne, and Infragistics. 

Ted tells me we will meet up in a few tables in the center of the dining room here at Mix tomorrow (Friday) at during the lunch break.

Anyone is welcome be there if you can!