I think that the Action Bar in 3.0 (and 4.0) is supposed to solve this problem. It's basically on top of every screen, and clicking the app's icon on the action

I think that the Action Bar in 3.0 (and 4.0) is supposed to solve this problem. It's basically on top of every screen, and clicking the app's icon on the action bar is supposed to take the user back "one level up" in the screen hierarchy.