Also, Apple is proving that multitasking (except in media sectors like music or social networking like twitter) is an old concept in need of replacement. When you think about it, your iPhone/Touch apps save where you were in the app and what you were doing. Closing and reopening is just like swiping to an open app.
It wasn't until someone pointed that out to me that it clicked. Read here: http://cloud-factory.com/blog/2010/1...-the-ipad.html