When you're using your phone are there some apps you use a lot and need to flick between? Do you think there must be a better way clicking the home button, then launching the app? Circle Sidebar is an Android app that solves that problem.
They borrow from the edge screen idea Samsung has and you swipe in from the side of your screen to see different actions. The actions are whatever you set. So if you have a few apps you want to quickly flick between try Circle Sidebar.
There is a free version here, and a paid version here.