Unlike most digital pens, Wacom's Inkling is designed to record drawings, not just notes. You can save layers of sketches and add or remove them later. You can also play an animation of your drawing process. The rechargeable ballpoint pen comes with a receiver that clips on to any paper to record sketches. You can save files on the receiver, which has 2GB of memory, and transfer them to a computer with an included USB cable. The pen comes with a carrying case that doubles as a charger.
Cost: $199.