How the iPad Works

Like the iPhone before it, Apple's new iPad tablet is a technological powerhouse with a multitouch-screen interface, an accelerometer that senses movement and tilt, an antiglare screen you can view from a side angle, a long-lasting battery and more. To uncover how the iPad works, you could dismantle the device and void the warranty. Instead, let me explain the embedded technology.
Apple declined to comment for this story, but I've done some digging and gathered information -- and some best guesses -- from various sources. I'll skip the hardware novelties that already exist on the iPhone, such as the oil-resistant screen coating and the accelerometer (those are covered in my previous article "How the iPhone works"), and give you the scoop on four under-the-hood technologies that, combined, make the iPad unique -- for now.

http://www.pcworld.com/article/193930/how_the_ipad_works.html