Sketch to Digital all-in-one.
This works by a small piece of kit that you can attach to the top of a page that is linked to the pen, when you start drawing or writing the pen records what you are doing and sends the information back to the device, much like a Graphics Tablet.
The Inkling even has Layer ability built in. This means if you are drawing a character for example and want the elements of the character separate then you can build the image into elements simply by clicking on the attached device on the top of the page to activate a new layer!
To show you what this looks like in action here is a video created by Liona Wu of her first Wacom Inkling drawing.
Definitely something I want to invest in soon!