It's actually rather easy to take a screenshot of the iPad's display. And because the screenshots are stored with your other photos, it is easy to get at them and email them to a friend or to your home computer.
To take an iPad screenshot, you simply need to press the sleep button at the top of the iPhone and the home button just below the display at the exact same time. The screen will flash momentarily, and your screenshot will be saved with your other photos.
Here's a diagram of how to take an iPad screenshot: