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My understanding of the process:
Android operates differently from Windows. When you leave most applications, they go into a sleep state and remain in memory. If you haven't used them in a while, they get supplanted by applications you've used more recently; that is done automatically. Unlike Windows, having your RAM filled is not a bad thing - it just means the recently-used programs or those that need to update frequently (some news sites, for example) start quicker. Apps that do various scans wake and sleep on their own.
You don't really need to use an app killer unless one of your programs is misbehaving, and you want to kill it to allow it to later restart hopefully without whatever the problem was.
Check the settings/preferences on your various apps. More of them now have a "show exit"-type choice for those more used to having that, than the first Android apps did. But it's not really necessary in Android.
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