[teorema]

OSX, to make the instances and windows of a given program that are running more immediately and passively visible. It's too easy to lose track of open windows in the background on OSX (yes I know you can swipe to see them, but that is something you have to do distinctly of other interactions with programs. This is something Windows and KDE gets right.

Also, the ribbon bar on desktop MS Office is inconsistent, with some things accessible via tabs/ribbons, and some not. in a ribbon UI, everything should be accessible through the same interface.