Yeah you do. There are apps that run in the background all the time.
You want to do some more reading before using your task killer then. You can certainly cause yourself more problems if you don't fully understand what you're doing (which I suspect if you're not fully aware of what's running on your Droid).I just got this widget and when i click the widget to kill apps it says it killed like 12apps but i dont even have 12 apps running?