Just thought I'd post a quick tip. Most of you probably know this, but you can quickly and easily take screen shots of your iPhone. Simply press the home button and the on/off button simultaneously and a photograph of your current screen will be saved in your photos. It works for anything. Much like this picture of an app I found in the App Store. Notice the one in the center is called "Fans of Iran".
It has many useful applications. You could take a picture of a map and send it to someone's email that needs directions. You could take a picture of a receipt sent to your email to file in your records. You could take a picture of an app you really like and text it to a friend as a recommendation. You could also take pictures of friend's crazy Facebook statuses or texts to post on Failblog!