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The built-in 'Task Manager' in your app drawer is more than sufficient to kill a runaway app if necessary. It shows everything running, with an option to show system core apps and an option to notify of high cpu usage. It allows for auto-end on apps of your choice. I don't recommend you auto-kill anything.
You can give it a shot (maybe a week) to see if it works. If it's saving battery by killing apps then I'd say no because the Android OS would start that app up again, using power in the process. I did see it in the Market (hate the name Play Store) and it doesn't look like it does it that way.