Coolite Inc, in collaboration with ExtJS, LLC has published Coolite Studio for ASP.NET.
"Coolite Studio is an Ext official suite of ASP.NET Web Controls based on the Ext JavaScript Framework.The suite of web controls were built with a focus on bringing full Visual Studio Design-Time support to the Ext JavaScript Framework. A marriage of server-side and client-side frameworks."
As they say on their home page, developers using Coolite Studio benefit from features including:
- Powerful integration of the Ext JavaScript Framework.
- Full Design-Time support in Microsoft Visual Studio 2005 & 2008 and Visual Web Developer 2005 & 2008.
- Drag-and-drop ease of use.
- Current support for Window, Panel and a many Form Controls including DatePicker, Calendar and HtmlEditor.
- New Controls being added weekly.
- Dual Licensed (LGPL 3.0 and Coolite Commercial License).
- Professional support options available shortly.
You can see it live on Examples page and download installation packages for .NET Framework 2.0 and 3.5 on this page.
I didn't have a chance to try it yet, but I will as soon as I grab some free time 
. If you try it, send your comments and thoughts!
