To take a screenshot or capture the screen image in iPhone 2.0, iPhone 3G, and iPod Touch (2.0 and later), just press the Home button and Sleep/Wake button (On/Off button at the top of the mobile device) simultaneously.
The Apple device screen will flash and an image will be automatically saved and stored in the iPhone or iPod Touch Camera Roll or photo album. Just click Photos to see the screenshot. From there you could email to yourself of someone you love (or hate).
