Update: 4th Feb 2009
I've been putting together a CRM application based on Ext JS.
Check out a demo of some of the functionality.
Update: 10th Feb 2009
There have been many fixes to the form designer. It is now working in Firefox. I also fixed a few ugly rendering problems that were going on.
Here's a short video of editing a form and adding a new field to it:
Next focus will be coming up with a nice business configuration for when users set up sites for the first time.
Welcome your feedback!