Voice Control in iPhone OS 3.0 took over the iPhone’s “press-and-hold the Home button to do something” ability, so the method to force-quit a stuck app has changed. Now you have to hold the power button at the top as if you’re powering down the phone. When you see the red slider, hold the Home button for a couple seconds. You’ll be taken out of the power down mode, and if all goes well, your app will quit.

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This is a major quality-of-life improvement across the board for the iPad.