Tim Farmer has graciously updated my example Ext JS/ASP.NET MVC application I posted a few months ago to work with the new Preview 3 bits.  I've already compiled and played around with it, so it seems to be working fine, but any bugs or issues should be aimed directly toward him :P

On a more serious note, this example application wasn't really meant to be an ASP.NET MVC tutorial, I originally posted it more to show how Ext JS works with the .NET stack.  I remember when I first started playing around with Ext JS what a learning curve it was, so I would consider it to be more of an Ext JS example that happens to use ASP.NET MVC.  There is already plenty of ASP.NET MVC information out there, but not much on using Ext JS with ASP.NET.

If you want to learn more about ASP.NET MVC, I recommend taking a look at Rob Conery's MVC Storefront webcast and blog series.  It's actually a pretty fascinating look at how someone new to Test Driven Development approaches building an MVC application in an agile manner.

Download updated Ext JS example for ASP.NET MVC Preview 3