Which Ajax framework should I use?

Via Dion Almaer.

Matt Raible did a nice comparison of four popular Ajax frameworks, namely Dojo, Ext JS, GWT, and YUI, using different evaluation criteria. Here's his conclusion:

After working with the various frameworks, we believe that all the frameworks were very good and could be used to write applications with.

We're using GWT here and GWT-Ext here, and I highly recommend them for core Java developers.