One of the interesting purposes of the Vibram FiveFinger foot glove (floove?) is to allow the user to walk or run shoeless yet avoid toe hazards such as rocks, glass, thistles and other callous-causing objects. There are several different models designed for various activities including running, hiking, and kayaking.
Some people are of the opinion that walking barefoot provides a pure and natural gait and therefore promotes better posture and avoids exacerbating foot problems that can come from ill-fitting shoes. Others believe that barefooting is fine but only on uneven terrain (such as when hiking) and should not be performed on flat surfaces such as city sidewalks. In either case, these look to be a great way to go au naturale.