Just finished my Sports med exam and this topic was covered. The coaches at some famous univs seriously believe its good. the research (from the articles which we had to read and one was conducted by "NIKE") also supports it.
here are the quotes from the coach (im not gonna give the name of school or team)
Coach -1 : "I can't prove this, but I believe that athletes that have been training barefoot run faster and have fewer injuries. It's just common sense."
Coach-2 : "You support an area, it gets weaker. You use it extensively, it gets stronger. Get on the grass and run barefoot and you don't have troubles. That's the first thing I did with all my athletes."
Iam all for it as long as the track/ground have been thoroughly inspected for small pebbles/gravels/thorns/etc to prevent injuries.