ms office ui redesign
I'm kind of excited about office's interface redesign; the whole "ribbon" thing, bringing features out of the deep, deep menus... "We want things to be more discoverable," says some developer here: Microsoft reveals details of Office 2008 for Mac. also there, a screenshot. via daringfireball.
(of course, new office requires vista, and I don't anticipate seeing vista anywhere for another year at least, and probably 3 years in many corporate environments. though office for mac might start showing up places in a year or so.)