The App Switcher experience on the iPhone leaves a lot to be desired, especially if you’ve ever used an iPad before. That said, it’s mind-blowing that Apple hasn’t done anything about this yet.
If you’re tired of waiting for Apple to implement an official solution, then you can now take advantage of a new free jailbreak tweak called Castmary by iOS developer Simulation to get an iPad-style grid-based App Switcher on your iPhone or iPod touch.