Apple, Amazon, Google Wage Content Wars

You may not know it, but your gadgets have a hidden agenda. Think about the electronics you own. No doubt there's a digital music player such as an Apple (AAPL) iPod or a Microsoft (MSFT) Zune. Then there's a smartphone—perhaps an iPhone or a Droid that sports the Google-inspired Android operating system (GOOG). For games, your family may have an Xbox 360, Sony (SNE) PlayStation 3, or Nintendo Wii. For books, there's the Kindle from Amazon (AMZN), among others. When the iPad hits stores on Apr. 3, you'll want that, too.

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