No No No..this is NOT another task killer debate type thread. Anyways, I use system panel light to check what is running in my background, just to have an idea. My question is, what is a cached application (inactive)? I am wondering, because I am trying to optimize my battery life and I want to know how this phone works with things running in the background. Should I end those applications that are cached, or are the really not doing anything sitting there?