Taking a Screenshot with your iPhone
Posted on July 25th, 2008 by John
Here’s a neat tip if you haven’t come across it already.
To take a screenshot, simply hold the Home button and press the power button. You will notice the screen flash, which means the screenshot has been taken. You should now find the image in Camera > Photo Roll.

[...] If you want to capture an error message or just a plain screenshot, iPhoneMad.com has a tip that tells you how to capture a screenshot using a built-in iPhone feature. [...]