This is how Apple should have done multitasking on the iPhone, iPod Touch, and iPad:

Yes, that’s right, what you just saw was visual multitasking. How was this done? Well, thanks to the developers of Multifl0w they have developed an app (Multifl0w) when combined with the free “backgrounder” app from Cydia you get visual multitasking. Multifl0w displays up to 9 apps at a time and you can get the app on the Cydia store for $4.99. Now, in order to do this, you must have your iPhone, iPod Touch or iPad jailbroken. If you want more info, click right here. As you can tell, this is how Apple should have done multitasking with the iPhone, iPod Touch, and iPad (soon to be).