[S2+AJAX]Which ajax libray did you use?

I am doing some research ajax+struts2. you know struts2.0 has the built-in supprot for ajax based on Dojo, but I found the components is not very rich, only have some basic function. I know there are a lot of ajax components for JSF. So what did you do for struts2, develop your costom widgets or u

Re: [S2+AJAX]Which ajax libray did you use?

Thanks to Jeromy and Ted , your comments definitely help me a lot. I looked through the YUI website, the widgets are quite rich. I still concern about if I want to use the Struts2 + YUI, I have to know pretty much about the YUI , right? Is YUI easy to learn and use? Since our developers don't kn