The benefits of walking and playing certain sports (particularly running) with bare feet is well documented. The argument is that training barefoot gives you better control with your movements and it shifts the weight of impact to ball of the foot rather than the heel. This improves efficiency and reduces impact force—which could help to reduce injury. Of course, there is plenty of danger associated with running round barefoot on rough terrain.
There are shoes out there that mimic bare feet, like Vibram FiveFingers, but if you really want to get as close to the real thing as possible, these Footstickers might be the solution. Unfortunately, it’s only a concept at the moment, but we can definitely see a market for them.