Originally Posted by Yeahha
Not running in my background. Even if it was it shouldn't be anything to worry about. Android keeps recently used services in the background so if you go back to the service it is quicker for you. You apparently do not understand how android handles data management and are likely used to windows. FAQ: Why You Shouldn’t Be Using a Task Killer with Android
this should help out some, feel free to google if task killers are needed for android if you want more sources.
Thanks, good link and I understand that (and yes, you're right, I am used to Windows), but that doesn't explain why Angry Birds Rio won't run without Amazon Appstore being installed (and presumably launching it). What is the point in that? Is it sending data back to Amazon? If so, what?