It's difficult for me to imagine why I'd have more than a couple of apps running in the background on iPad. But, then, I'm a very happy iPhone user who feels like Push Notifications are a great 80% solution to multitasking and who only very rarely feels the need for that other 20% to be taken care of. I'd like to have an app running in the background (other than the "iPod" app) playing music. But clearly I don't need more than one of those. Maybe true multitasking would allow better IM clients. I could see running one or two of those in the background. What else? I'm not going to be downloading torrents on my iPad.