I hit F9 just now and my mind boggled at the number of multi-paned interfaces I saw. Of the 14 windows I have open, 13 of them have panes or sidebars. (12 if you don’t count GMail). I’m also not counting the columns view in the Finder….
Of course I felt compelled to hit F9, which produced not as many windows (or panes) as Paul, but still — lots of interface elements, both in number and in diversity.
With toolbars, drawers, sidebars, tabs, etc. spreading like a game of Qix, the multitasking sure is, well, tasking sometimes. Wasn’t there some sort of one-window-per-app ideal back in the day?