What is your favorite iPhone, iPod touch, or iPad gesture or shortcut? iOS 4.3 gives the iPad some new ones like ability to swipe between apps but there are already . Pinch to zoom has always gotten a lot of attention, keyboard shortcuts are real time savers, two finger scrolling in form fields is sweet, and the rotor in VoiceOver mode is very cool, but I think that the one I most appreciate is the single finger tap on the status bar to jump back to the the top of any page (I wish my Mac had that!)
How about you? What's your favorite gesture or shortcut? And do you have a least favorite?