It looks like you can bring multitasking on your iOS device after all thanks to Zephyr. But first of all, you have to be jaibroken. From swiping up to show the multitasking switcher or quickly swiping to a different app, Zephyr is all you need to quickly and easily control multitasking. Only two gestures are supported right now but this project has a bright future and after spending a couple of minutes with those new features you will realize that this is something your iPhone or iPad was missing after all. Also, it is very simple to get what you want. All you have to do is to jailbreak your iOS device and install Zephyr application on it. You can find the app mentioned on Cydia for $2.99. But if you do not believe me, try to click here and see how the unofficial multitasking works great on iPhone. I am also looking forward to see a lot more gestures, hopefully, coming up soon.