This BBC article is interesting.
Basically, a man lost the tip of his finger in a model aeroplane accident (you stick a finger in high-speed propeller, you've gotta expect that, really!).
With application of a specialised product, regrowth of cells was promoted over the formation of scar tissue, and the man now has his finger tip back - including finger print, nail, and full sense of touch.
Amazing stuff - it's gonna be great when they get this working for larger, more complex parts of the body. I'm thinking that a lot of amputees may get their limbs back, in the not too distant future.