in the tv commercials you see them switch through their apps in full screen mode by swiping to the left. I think we need a two finger swipe or just a off side of screen swipe to switch apps side by side. Obviously this would need to be able to be able to be a toggled feature.
Maybe even combinable with holding down button. Ie swipe left from side to move through apps in a windows aero-like manner or hold button and swipe to cycle between apps in current stack.