Restoring the cervical curve and reducing forward head posture with simple head weighting and proprioceptive training:
http://www.haloposture.com/PettibonReport.pdf
5# head weight available here:
http://store.titleboxing.com/necstreb.html
I need work on this, I personally have a lower cervical curve reversal. Now that I've figured out my mid-back pretty well, my neck is the next major issue I'm working on. Instead of the wobble chair used in the study, I will likely do some simple joint mobility stuff from Z-Health, along with walking barefoot/Vibram, all with the headweight on.