One feature added to the new iPhone 2.0 operating system is the ability to capture whatever is on your screen at the moment with a button combination. Hold down Apple's Home key and then the Sleep/Awake key on the top right corner of the iPhone (the same key you tap to start up your iPhone from sleep).
Once the button combination has been struck, you will notice the iPhone screen flash white. After it does that, go to your photo gallery and you will see the last addition is your screen capture.
Next, in the lower left hand corner of your photo gallery screen, you'll see a box with and arrow coming out toward you. Click on it and you can send this photo to your email or if you have MobileMe, you can send it to your web gallery. This is awesome!