If you were hoping I'd try out Watchdog, I'll disappoint you I'm afraid I personally see no need for task killers under my current usage of my eDGe. To date I haven't spotted an app that hindered performance. Where battery life is a concern, I merely turn off wifi and/or set the screen timeout to 2 minutes or less, and or simply close up my eDGe when not in use

Question for you: would it not be a concern that Watchdog is now running all the time in the background, measuring and tracking things?

Which prompts me to again remember that in Android, very few apps actually "run" in the background. When you switch to another app, Android pauses the app, stores it state to storage and shuts it down (recall that you can't have multiple apps open on the screen at the same time, side by side, like a desktop OS like Windows or OS X). When the user returns to it, Android restarts the app, tells it to reload its data from storage, and resume working. I'm guessing at least 80-90% of the apps we install don't actually run in the background, and most of what else is running in the background are Android system processes (which you generally mustn't kill). The notable exceptions are music players, email, and utility apps like Watchdog.