Reminisce brings an awesome new way to quickly switch between recently used apps
                              Reminisce brings you a whole new experience to switch between apps.  With a swipe from the right (or the left depending on settings) it shows the last 5 most recent used apps that you can hover over and open.  This tweak works anywhere in iOS including your Home screen, in-app, and on the lock screen.  
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http://feeds.iphonehacks.com/~r/iphonehacks/~3/s0pwWrWfS04/reminisce-quickly-switch-between-recently-used-apps.html