Pounding Pavement by Heel or Toe
http://well.blogs.nytimes.com/2013/10/16/pounding-pavement-by-heel-or-toe/?_r=0
Some more interesting information on running, though not specific to barefoot this time. It seems you can’t get away from physics, striking with your forefoot or your heel result in the same overall impact, but you can shift around where the main stresses occur and for those of us able to shift from forefoot to heel impacting ‘on the fly’, we can give different portions of our anatomy a bit of a break.