There's only one physical hardware button on the front of the new iPad so it's little wonder Apple has put it to work with several levels of functionality. While all the basic things are covered by the good old single click, there's a lot more, and a lot more advanced functionality hidden beneath that Home button using double and triple clicks and more.
iPhone or iPad feeling kind of sluggish or an app freezing up on you and wondering how to manually force-quit multitasking apps to free up memory? iOS 5 does a great job automatically pausing or killing background tasks, but once and a while a big game, rogue process, or similar situation can drain resources or tie up memory. Luckily, iOS 5 makes it easy to quit these apps any time you like.