Twitter’s iPad app introduced a card interface in which context is kept by stacking new screens on top of the previous ones. Navigation between the screens can be achieved by either sliding the screens/cards or by clicking on the visible slice of a card bellow. Sliding from left to right in the navigation bar shows the labels of the menu items. Overall the navigation feels natural and an extreme improvement over the Twitter’s phone app.
When I read about “visual momentum” on the first paper this is the first thing that pop in my mind.
I highly recommend this app: App Store