Do you hate how your iPhone leaves app icons in the multitasking bar even though they aren't running anymore? How about when you have to go through that tedious process to exit an app; click the home button twice, tap and hold an icon in the multitasking bar, wait for it to jiggle, and then click that tiny red delete button to quit.
Luckily, there are other people that feel the same way. MultiCleaner is a jailbreak app that relieves the cumbersomeness of managing your multitasking apps. In fact, the app's tagline is quite simple, "Because iOS 4 multitasking sucks..."