Creating iPhone Icons

I’ve been poking around for a decent tutorial on how to create icons for the iPhone. Specifically, I am looking for a walk through with either PhotoShop or FireWorks. The icon I have in mind is what will be shown on the home screen of the iPhone as well as on the App Store.

The first tutorial I found that does a nice job of walking through the basics is from KeepTheWebWeird, you can view the tutorial here. A screenshot of the example created is shown below.
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