For most runners who have worn shoes all their running lives the transition, for those who feel comfortable taking this path, should be gradual to build up the foot muscles that make running a more natural running form. Use of minimalist shoes should be integrated into training over time perhaps several months as the foot muscles develop.
Checkout the website which has lots of useful information and videos.
Why Consider Foot Strike?
Foot Strikes & Running Shoes
Running Before the Modern Shoe
Biomechanics & Videos Running
Barefoot & Training Tips
http://www.barefootrunning.fas.harvard.edu/ Running Barefoot or In Minimal Footwear
Another article based on the Lieberman et al paper:Barefoot Running Better In Some Instances
Wikipedia – Stress fracture and prevention