I bought the new Wacom Inkling Digital Sketch Pen from Amazon, but it did not work very well. The pen is supposed to make two copies of sketch at the same time -- a real ink on real paper drawing, and a digital image, stroke by stroke. However, after I got home and uploaded the digital image to my netbook, the results were not pretty. The Wacom Inkling recorded several drawings (not several layers of the same drawing), while I was drawing a single pose.
The Wacom pen and ink drawing on newsprint:
The 3 best partial drawings of the above image, after I uploaded the digital drawing to my computer: