I searched around and read that if you're in an app and want to close it you press and hold the Home Button for a few seconds. When I do this with the 3GS it goes to Voice Control. I'm new to the iPhone and I'm huge into closing apps so I don't waste my battery. How do I make sure my apps are closed after I use them? A perfect example is TweetDeck...there is no "Log Out" button. Thanks!