In this video from DontPokeMeSoHard he shows how to take a picture of your iPod Touch's screen. If you hold the home button and press the power button, it will take a picture of whatever is on your screen at that moment. It will save the picture in your photos under Saved Pictures. If you're trying to remember a page on the Internet, it's a great tool for that. Just take a picture of it and it will save on your photos forever. You can view web pages now without being connected to the internet in this way.
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