For a while, you have been able to install a stack on your iPhone or iPod Touch. But just recently, the ability to add a stack has been added to Installer.app. Stacks behave the same that you would expect them to. Just tap "Install Stack" and restart your device. The stack will be added to your Dock. One is added to the Dock and when you click on it, it's contents fan out. Here are some screenshots:
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