In case you hadn't noticed, barefoot running seems to have exploded in popularity recently. From Paleo and primal enthusiasts to the Barefoot Running Society (with nearly 2,000 members), to crazy people trying to run across the country barefoot, barefoot running has certainly become a craze over the past several years -- despite significant advances in shoe technology, enhanced shoe features like better cushioning or motion control, and even the advent of special fitness shoes.