Wacom has just introduced a rather interesting product called Inkling. Kudos for coming up a product that mimics the tactile feeling of drawing.
It consist of a receiver that you clip to your drawing surface such as a notebook, and a Wacom ballpoint pen. While you're drawing, the receiver will record your lines — your drawing — and allow you to open them digitally after you transfer to your computer via USB.
The retail price is set to be US$199. I hope they don't charge ridiculous prices for their ink cartridge.