Google Android phones will show you a list of recently opened apps if you press and hold the Home button. But if you want to see a list of currently running or recently closed apps, you’re out of luck — unless you install a third party app.
MultiTask Manager will show you both, as well as give you the option of killing any task with a long-press. As an added bonus (if you consider this a bonus), it works a lot like the new task manager in Apple’s iPhone OS 4.0.
Once MultiTask Manager is installed, you can pull up a list of running apps by pressing and holding the Search button on your phone. You can scroll to the left and right to see more apps. And you can switch to any app by pressing on the icon. You can also change the background, choose the maximum number of apps to display, and select frequently used apps that will always show up in the tray whether they’re currently running or not.
MultiTask Manager is available as a free download from the Android Market. You can also grab the source code from the project page if you’re into that sort of thing.