Any idiot can use an iPad at a basic level. It's designed that way. But even still, there are things that you're just supposed to magically know—things no one ever necessarily tells you. So we're here to help.
The Soft Reset
The single most common thing people don't realize about the iPhone OS (from my experience) is how to perform a soft reset—which you'll find extremely useful in cases when the system freezes.
Just hold the top (power) and bottom front (home) button for a few seconds. Your iPad will restart. To force quit an application, just hold the home button by itself in a similar fashion.
Cut, Copy and Paste for Experts
Copying text is as easy as double tapping a word. But when you want to copy a whole paragraph, like for an address, you have to stretch those annoying little blue knobs...or do you?
Tap any editable text four times. You'll highlight the whole paragraph.
Import Your Own (Free) Books
Apple's iBooks app is your portal to reading and buying eBooks on the iPad—and it includes a section with a few free books. But don't forget, just like iTunes and the iPod can import and play music downloaded elsewhere, the iTunes and the iPad can import and display books downloaded elsewhere. Formats are limited, however. The iPad only supports ePub (with or without DRM).