Even though Dolphin browser on the iPad is similar to what's already been available on Android and the iPhone, it almost makes more sense on the bigger screen. Also, I think it's my most favoritest iPad browser right now.
Safari on the iPhone is as good as it gets for mobile browsing. But it's missing the deeper features, like true tabbed browsing, a full screen mode and a slew of other settings. Dolphin Browser adds all that.