In my experience using a task manager/killer, I noticed problems developing within my phone over time. Lately, my Droid was freezing, rebooting, and bricking up when I did a battery reseat. I did a factory reset, loaded some apps back onto the phone, and everything seemed fine. when I reloaded "Advanced Task Manager", the phone started to act up again. I did a little research on the net and basically found out that task managers aren't really supposed to be on an android phone. Once I uninstalled the task manager, my phone started to run like a champ again. I'm convinced that I no longer need or want one.