This looks darn handy. It's a Revit 2013 add-on utility that arranges your viewports in Revit. You may already now some of the keyboard shortcuts like WT for window tile, ZA for zoom all, and Ctrl-Tab for switching between open windows, but this utility gives you even more handy flexibility in arranging windows. It's called Palladio X and it's free, thanks to the folks at Mensch und Maschine Software SE. I like the classic architectural reference...
