[header] How to create an iphone app demo [title] Make up your mind about the scenario you want to demo. [step] One of the best selling scenario is showing your potential users how your app solves one of their problems. [title] Take screenshots of this scenario, screen by screen. 
[step] When you are on a screen that you want to capture, press and hold the home button and then press the power/sleep button. Your screenshots will then appear in your photo gallery on your iphone/ipad.