The iPhone may promote good save-game behavior
On the iPhone, the user can quit a program at any time using the Home button. The program cannot keep running if it isn't one of Apple's—it must quit. (Maybe it can refuse to obey the Home button—I don't know, and that would suck if true.)
I wonder whether this will encourage game developers to allow the user to save at any point in the game rather than forcing him to save only when the developer decrees it proper, since they'll have to either quicksave when the user exits or throw away the user's progress. Throwing away progress is an even better way to piss the user off.