ExtJS has just release the beta of their upcoming version 3 of their Core library. They have spent some time refactoring the code and have reduced the overall footprint. You can download the release and give it a try.
I've been spending quite a bit of time lately working with jQuery and I can see by this upcoming release of ExtJS Core that doing simple things can also be rather simple, and lightweight.
I can't wait to start trying it out.
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