I need to write a temporary Web-based graphical front-end for a custom server system. In this case performance and scalability aren\'t issues, since at most 10 people may ch
Out of all the JS frameworks out there, JQuery and YUI are my favorites. They accomplish a lot of the same but in very different ways.
For your request (lazy, easy, and powerful) I would vote JQuery. If this is something that will be more long term and more of an application that is very verbose and code heavy, I would vote YUI.
I really don't think there is anything out there that is better than these two frameworks. Either choice is a good one.