What is your favorite Javascript UI framework out there ?
slantyyz: UkiJS (http://ukijs.org/) is pretty nice too.I took a serious look at SproutCore and Cappuccino for a web app (not site) that I'm building, but jQuery is so damned easy to use, that it was not easy to justify spending a few days learning yet another framework.The thing that made me totally drop any further investigation into SproutCore and Cappuccino (and UkiJS, for that matter) was the JQuery layout plugin (http://layout.jquery-dev.net/). It makes your GUI construction super simple, and then you can cherry pick the jQuery UI elements that work for you.