This is a really handy little app for grabbing iOS screenshots.
I help a developer who writes iOS apps - he sends me the app to test and to produce the screenshots for both the iTunes store and his website. I just run the app in the iOS Simulator then set the counter, filename and save location, then it's as easy as navigating to the screen I want in the app being tested and clicking a button. There's a nice variety of output formats too. Saves me a lot of time.