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Documentation
Ext JS 3.0 comes with extensive documentation. The documentation viewer is itself implemented with Ext JS, providing an excellent ExtJS example.
Desktop Look
Ext JS lets you create GUIs that look just like many desktop applications, complete with tabs, trees, resizable panes and so on.
Declarative Approach
You can add a toolbar to any window or panel in Ext JS using a declarative approach with objects in JavaScript. The toolbars are very rich, with drop-down, checkable menus; pop-up calendars; and more.
DataView Controls
The latest version of Ext JS supports several DataView type controls, like the one here. What you can't see in this static picture is that the items in the DataView are selectable and can even be dragged around.
Grids
As seen with this grouping grid, grids are as complete as they are for any desktop development system.
Portal-Style App
This is an example of a portal-style application. The boxes on the right can be dragged around and rearranged.
Combo Box
One cool feature is the combo box can use AJAX to fill in the drop-down list on the fly. Rendering is performed using a template that the developer specifies.
Desktop-Style App
You can even create a desktop-style application right inside the Web browser, with icons; draggable, resizable windows; and a Windows-like start menu.
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eWEEK Labs' Jeff Cogswell has spent some time testing Ext JS Version 3.0, a JavaScript library for creating sophisticated AJAX-powered Websites. Following are screen captures of some of the sample applications that come with Ext JS.