There are a lot of apps that let you take a picture using the iPhone's built-in camera... but I recently discovered Photo Double Fun which lets you use BOTH the front and rear cameras, simultaneously, to take photos as well as videos! Why is this so cool? Suppose you want to document that you were at a specific location, seeing something in person. The Photo Double Fun app combines the two images into one, and if you use their free version, it adds a watermark and you can only store a couple of photos at a time, without upgrading. Here's an example from last week's Worldwide Developer's Conference.
Keep in mind that the camera in the back of your iPhone takes better pictures, so you may want to prioritize that view. This photo is of my friend, Ronny, who received an award for his contributions to the community. His mother was sitting at my table, watching her son get the award. Double Photo Fun enabled me to capture the exact moment when he received the award, and his mother's reaction, for a priceless memory!
Double Photo Fun is a neat idea and you might find it useful when spotting celebrities, watching a sporting event, or visiting historic sites. I was a little confused because photos are NOT stored in the traditional camera library... the app has its own album, and then you can send the photos to your library or to others via email and twitter. Once you understand that, it's easy. I would only warn certain politicians who might not want to use the app when trying to photograph things that should remain anonymous! This app is just one from the guys at SellYourMac.com. Check out the rest at http://www.sellyourmac.com/iphone-apps.html