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PagePreview is a neat jailbreak tweak that allows you to preview all your iPhone's Home screens from the current Home screen by just dragging your finger on the page indicator dots, right above the dock.
PagePreview has recently been updated by Elias Limneos to add support for iOS 5.1.1.
You can also jump to any Home screen, by dragging your finger on the page indicator dots and then releasing it when you see the preview of that Home screen.