A 10-Step Guide to Not Dying at Your Desk
GQ Magazine's October 2011 issue recommended the Freedom Headrest in Josh Dean's 'Don't Let Your Desk Kill You'.
Check out GQ's quick reference office ergonomics slideshow
If your chair has a back lock, unlock it and adjust the recline tension according to your body weight. Your chair should comfortably support you throughout the entire recline range.
Ergo Gear Guide