I agree that Jquery UI leaves a lot to be desired and the widget-selection is an outright pity when compared to the competing frameworks. However in their defe

I agree that Jquery UI leaves a lot to be desired and the widget-selection is an outright pity when compared to the competing frameworks. However in their defense you have to keep in mind that the project is (from what I gather) run entirely by volunteers. It is quite hard to match the inner consistency and widget-count of a YUI or extJS when most of your widgets originally began life as external jquery-plugins from various sources. Under those premises the level of integration they have achieved so far (themeroller et al) is actually quite respectable. Personally I hope at some point a company will step in and sponsor them some fulltime devs. A few dedicated developer-months could probably work wonders here.