If you're tired of switching tasks by holding on the home key, try Taskbar Switcher! The recent activities are displayed directly on taskbar. Extremely convenient. Just slide your taskbar and tap on previous task you were doing. Additional (optional) "return to desktop" button - you can do everything without pressing the home button. Half a second. Simple yet powerful.
Go ahead and grab it - its completely FREE!
Taskbar Task Switcher (FREE) - Google Play Store