Another advantage of Apple's continuance of a number moniker for iPhone? Being vindicated in your belief that the iPad dropped the '3' in its name because a smaller iPad was waiting in the wings, and trying to tell John Gruber that via email, but him ignoring that theory until he read it somewhere else. Psh. Gruber... -Ray
Another advantage of two buttons? Instead of double-clicking one, click one then the other. Booyah!