The other four could use some work, but I thought Ma-Ti was spot on.
Andre Smith's stomach TotallyLooksLike Yip Yip Aliens
Barefoot running has become an increasing trend, and a possible alternative or training adjunct to running with shoes. While anecdotal evidence and testimonials proliferate on the Internet and in the media about the possible health benefits of barefoot running, research has not yet adequately shed light on the immediate and long term effects of this practice.In layman's terms: their position is that they have no position.
Barefoot running has been touted as improving strength and balance, while promoting a more natural running style. However, risks of barefoot running include a lack of protection--which may lead to injuries such as puncture wounds--and increased stress on the lower extremities. Currently, inconclusive scientific research has been conducted regarding the benefits and/or risks of barefoot running. (APMA)
Regardless of what anyone tells you (proponents or opponents) there is no study that conclusively measures the effects of barefoot running.