Healthbolt.net has a great infographic about how your body reacts to stopping smoking and when it actually starts to recover. It a great combination of a timeline with a description of the symptoms that smoking quitters experience over the period of time.
Information is power, and the understanding of what to expect gives quitters to power to overcome those symptoms. Too many go back to smoking because they didn't understand what they were experiencing was normal.
They had started by selling this as a high-quality poster, but now its available free as an 18MB PDF for anyone to print. Kudos to them to making this availble free to smokers trying to quit everywhere.