I've already updated one of my sites and am indeed impressed by the simpler and cleaner UI. Just as one very simple example, it was always annoying in earlier versions of WordPress that you had to click on the down arrow in the left navigation admin menu to get to the menu choices. The new fly-out menus are a whole lot easier! Similarly, the simplification of the upload process to a single button is a nice step.
There are a veritable TON of other changes and fixes for those interested in the gory details:
http://codex.wordpress.org/Version_3.3
All in all it looks like quite a solid release. I'm looking forward to seeing how it works on my other sites!
P.S. WordPress 3.3 is available for immediate download, although if you are running any recent version of WordPress you can simply "update" your site (after backing it up!) through the admin menus.
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