I need to write a sophisticated website that does AJax, drag and drop, component re-sizing, with a tree view of all components.
I know YUI3 is still under development so I'd have to use the tree view from YUI2.
I'm torn because it appears that YUI3 looks up and coming, jQuery is most popular, and GWT looks to be the fastest... and afterall, Google uses it for some amazing things.
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It is YUI 2 based..
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I'm a member of the YUI team, so my advice would be impartial on this -- I do think YUI 3 has unique strengths that are worth considering.. I wanted to point out, though, that there is a port of YUI TreeView for YUI 3 in the Gallery.
That might be a good way to build on YUI 3's strengths while still falling back to the TreeView behavior from the 2.x codeline.. -Eric.