I'm helping a colleague of mine get into a RIA start-up and the original development he used ASP MVC on Windows. Do you know if any of the RIA JS frameworks play nicely with ASP MVC?
How about Knockout? So it's not a 'full' RIA JS framework, but in my mind, that's no bad thing:
http://knockoutjs.com/
It feels like a nice fit to MVC/MS stuff (there's certainly plenty of examples of this, and Steve Sanderson now works for MS). And it's easy to bind whatever UI you want to your view models.
Personally I now use KO for even the smallest of JS/HTML 'apps'. It's lovely :)
I've used ExtJS with ASP.NET MVC for a few years, and it was quite nice. Just have the controller functions return JSON serialized data instead of a regular view. If decoupling the UI from the server side portion of the app isn't a concern you can also use Ext.Direct, which will allow you to call your server side controller methods from JavaScript by just doing:
