Sencha Ext JS is the leading standard for business-grade web application development. With over 100 examples, 1000 APIs, hundreds of components, a full documentation suite and built in themes, Ext JS provides the tools necessary to build robust desktop applications.
By following this path to getting started with Ext JS, you'll be up-and-running in no time. Once you have read through these articles you can dig into our more robust API documentation.