We are still a little way off re-growing entire limbs, but we are certainly making strides towards it. Invetech and Organovo have created the first 3D bioprinter, which is capable of printing entire cells. According to Organovo CEO Keith Murphy, the potential uses are wide-ranging - from supporting existing kidney cells to forming the foundations of a tooth.
With a printer capable of producing "tissue on demand," researchers and surgeons will apparently be able to easily repair organs without waiting for a lab to catch up; just press the button and go. It's all a bit freaky, but if these end up in every hospital they could literally be a life saver.