Someone on Birthdayshoes.com posted this recent article on Canadian Running, which showcases a study conducted on real-world footstrike patterns at a marathon race back in 2009. Interesting results, and I hope we will see more of these studies conducted as barefoot and minimalist running has grown so much since then.
http://runningmagazine.ca/2011/12/sections/training/blogs/actual-data-on-foot-strike-patterns/
http://runningmagazine.ca/2011/12/sections/training/blogs/actual-data-on-foot-strike-patterns/