Serenity, I advise you to read the whole Task Killer thread somewhere in this forum, just search it. It basically says that AndroidOS is different than what you may think, compared to Windows where you see a task running, it means its running, but in AndroidOS just because Advanced Task Killer is showing apps, it doesnt mean its using any CPU. Its just there to speed up the whole user experience. If you use a Task Killer, in the end you are just slowing down the whole phone entirely, making the apps take longer to load, etc.