It's Better Bookmarks! (working in FF 1.5.x, FF 2.x, IE 6, IE 7, Safari 2.x, Opera 9.x)
Along with Yahoo! Answers (though weening away), I've implemented for Bookmarks, the drag-n-drop functionality, ajaxy stuff (all with the YUI libraries) and symfony integration. I hope people actually use this product as I've put in many, many hours and weekends. You can see it in action in this short video conjured by one of our UI designers:
There's the obligatory States-centric webapp as well as localized flavors for your viewing pleasure:
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