I still bemoan the demise of openlook and especially the "motorized" scrollbar. It was amazing how functional something as simple as a scrollbar can be when pushed ot its limits.

I hate the "clean" look of modern UI toolkits where functionality is being removed in the name of some "minimalist" ideal and the choices of what stays seem completely arbitrary or at best are a common source denominator between what's viable with a mouse pointer and a finger touch.