I was reading an article by Matt Campbell’s how to make iPhone Apps blog, and he suggested some nifty applications that would help an iPhone developer in his or her quest to becoming more efficient.
You can demo your iPhone applications by creating videos with actual fingers shown where your mouse cursor is moving. It makes for a better presentation and video
MockApp allows your to brainstorm without even any programming knowledge, a new iphone app idea, and illustrate to a developer what the iphone app should be doing. This could be something you as a developer could use to quickly draw up something for your client before proceeding with the coding goodness.