Photos
Apple's way of presenting photos is already highly acclaimed. Especially taking flick scrolling to this new level where it can be combined with a larger screen real estate, should really give you the feeling of an "iPhone on steroids". We're sure it's going to be a whole lot easier to bring out old memories when friends comes to visit after the Apple iPad hits store shelves than before. Showing photos on a laptop is fine, but the Apple iPad will basically act like an advanced photo frame in that regard. There's likely no smartphone or laptop that'll be able to beat that experience.
Photos sync from computer (there is no built-in camera), and their presentation is an iPhone/iPhoto hybrid. Albums can be touched, dragged, and popped open really smoothly. And another gadget category Apple probably just snuffed out: digital photo frames. When docked, the iPad can cycle through photos at full screen.