Multitasking got a huge boost in iOS 7. Not only did Apple expand background processing to every app — and intelligently so! — but they created an entirely new fast app switcher interface as well. Based on the cards metaphor, you can now flip through them, and even flip them away... And you can do it for up to three apps at a time!
It's much easier if you see it in action, so make sure you watch the video above before you give it a try. Once you do, let me know — how does it work for you?