My wife has an iPod Touch and we were running through some of the same apps that exist on iOS and Windows Phone 7.
At several points we both accidentally clicked the wrong link/button/UI element etc. on our own device. There was one glaring difference, however; the iOS versions often land you in a place where you have to navigate through the home screen and back into the app where you accidentally made the click.
Not so, with Windows Phone 7: there’s a dedicated, hardware-based back button. This makes it easy to back up through your screen progression to the last place you were at.
It’s so simple that you think that it wouldn’t be necessary, and yet, there she is…my wife pushing the empty space on her iPod like there should actually be something useful there.