Wacom Inkling is the easiest way yet to go from hand-drawn to vector:
With the Inkling, digital drawing feels like traditional drawing because it is. The Inkling is basically an A4-sized clipboard that works with any old piece of paper you have lying around, complete with a pressure-sensitive drawing stylus that’s actually a pen. You draw on your paper clipped to the Inkling using the pen, and a detachable sensor records your strokes so that you can later upload them to your computer via USB. Tapping the sensor also creates new layers, so that you have a more flexible file to work with after import. The Inkling is wire-free and rechargeable with an estimated 8-hour battery life, so you can use it wherever you want, and the pen takes standard Mini Ballpoint refill cartridges, so there’s nothing expensive or specialized to replace.