This video sums up Dr. Lieberman's research and provides some good visuals:
A recent study by the University of Massachusetts made a few of the following conclusions:
- Midsole cushioning in shoes doesn't do as much as people think it does
- There seems to be little difference between minimalist shoes (in the case of the study, shoes with 4mm drop, so not Merrells or Vibram FiveFingers) and highly cushioned running shoes in terms of shock absorption (unfortunately, test subjects landed on their heels in both types of shoes)
- Barefoot runners had lower impact forces than both the "minimalist" shoes and highly cushioned shoes
Is barefoot truly better than shod running? Like the article said, scientifically speaking, we still don't know. It works for me though, and that's all I care about.