It seems like task killer apps are some of the best selling apps in the Android marketplace, but isn't this because past Android phones didn't have the capability to kills apps themselves? I know the Droid can run pretty efficiently without killing apps, but if you do need to kill them for some reason the Droid has the ability to kill running apps and processes without an app. It's under Settings ---> Applications.
Are there many people that are unaware of this capability? Because I am surprised of the number of people who download an app killer applications from the marketplace for their Droid. I know some of the app killers have advanced features, but I'm assuming the great majority of people are using them to manually kill running apps.