Mac OS X is Cmd+Tab to switch apps and Cmd+` to switch windows.
Of course, so much more was gained, the point of no return has long been reached ;-) Now the question, to Gnome 3 or not to Gnome 3?
Am I going to freak out as a gnome-do + compiz + dual monitor (laptop + external) user, or, with time, one adjusts, and, like an arranged marriage, learns to love the other?