Recently I was asked about how to make a simple screenshot on an iPhone. Although it’s not much of a secret there are still iPhone owners that don’t know how to do it.
You can achieve that by a very simple key combo: Press shortly the Home button and the Power button at the same time (until the screen flashes up).
The screenshot is stored inside the Camera Roll in your Photos App. Now you can sync it with iTunes and finally your screenshot is placed in iPhoto (or any folder you have selected in iTunes for syncing photos).
Taking a screenshot works at any time within any application you are currently using.