Infragistics [1] is already deeply involved in Silverlight development [2]. They are excited about the platform as the next-generation Web UI. They think there are several key wins in Silverlight [3] for Web application development and are exploring how they can best provide controls and tooling to complement what Microsoft provides in the box.
At TechEd this year the showed a proof-of-technology demo based on Silverlight 1.1. Controls they have been working on: Image Slider, Slider Panel and a Chart control.
Get a taste of what they're doing with Silverlight [4]
