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by esmevane 5259 days ago
Let's see:

Button groups. Toolbars. Icons sprites. Progress bars. Checkboxes and radios as buttons. More appropriate terminology (Tooltips instead of Twispies). Some retouches on styling and class naming. An overall increase of functionality for most of the existing stuff.

It's definitely a worthwhile upgrade, and it seems to be all added functionality, not a lot of semantic changes.