I needed to get screenshots from the iPhone for my book. But, there is no way to capture the screen with its built-in capabilities. However, Erica at TUAW.com developed a command-line screenshot utility to do just what I needed. However, in order to use her utility, you need to a fair amount of geeky things to your iPhone in order to make it work. Here's a link to a great step-by-step guide if you want to learn how to hack into your iPhone. It took me about 2 hours to make it through it, but now the whole thing works like a charm.
By the way, to automate the screenshot procedure, I recommend using two Expect scripts to capture the screen and then copy back over to your Mac. I then encapsulate those two calls into an AppleScript. Doing this, you can perform a screenshot through a simple mouse click.
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