The iPad is shipping. MacRumors.com reports that Apple has just started sending out shipping notices from the Apple Store. If you placed your iPad pre-order on day one, you should get your notice at some point in the next few days.
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This does not mean that the iPad itself will ship out early, April 3rd is still the expected date. However, it is possible that a few will leak out early. UPS is working with Apple to hold products until the right time, but no one is perfect. Mistakes get made. With any luck, one of those mistakes will result in a detailed unboxing video.