I've been working with Netbeans and Java for several years now - building Swing apps and more recently, web applications. I have not written much in Javascript, but I have some basic idea of how it works.
I have an application to build that needs some quick interactive responses and AJAX appears to be the right technology to use. My question is simple - which AJAX toolkit(s) are most effective these days, and are they available in the Netbeans environment. I know about DOJO, and I've seen some others. I'm not interested in starting a flame session or getting into a 'religious' war

, but I would like to get a sense of what is both effective and popular so if possible, I won't pick a dead-end toolkit to work with...
thanks in advance,
nbc