The Discovery Channel has a really cool infographic on their web site, entitled Why Running Shoes Do More Harm than Good.
Here’s some of what it covers:
It has an interesting timeline pointing out how humans went barefoot for at least 200,000 years (and of course, all the animals we evolved from went barefoot, too).
It mentions the Tarahumara Indians of Mexico.
It contains a comparison graphic of shod vs. barefoot running:
It looks at joint stress:
Go check it out, here.