Tapose

Tapose is an interesting app, and shows what an alternate universe might have been like if Microsoft hadn't killed the Courier project.

And while interesting, it also shows some good reasons why Microsoft was correct to cancel the Courier.  It would have had two physical screens with some separation between them.   Without the ability to slide the center like this app does on the iPad's single screen, Courier would have always been weird for anything other than this sort of tool.