I'm suprised to see all the negativity about ExtJS. There is one aerea where ExtJS is much better than JQuery: visual widgets. JQuery UI lags far behing ExtJS.

I'm suprised to see all the negativity about ExtJS. There is one aerea where ExtJS is much better than JQuery: visual widgets. JQuery UI lags far behing ExtJS. ExtJS offers a large array of widgets, with a consistent look. It should be mentionned that you can replace the ExtJS base library with JQuery, so you get the nice ExtJS UI widgets + the JQuery DOM interaction. For websites, I use JQuery. But if I build a web application that looks like a desktop application, ExtJS is much better at it.