Be healthy and support a cause at the same time!
I like promos that do not only advocate services or products but also encourage participation in a worthy cause. Just take the case of NESTLE Fruit Selection Yogurt's newest campaign called "Be Good To Yourself" (I first learned of this through Nuffnang) This campaign is truly a good way to start being good to yourself.
NESTLE Fruit Selection Yogurt (my ultimate favorite is the strawberry version, by the way) is healthy (it has live micro-organisms that are good for digestion), the product also encourages people to start taking better care of themselves by getting rid of unhealthy things in their lives and replacing these with good things and they have this campaign where you can help a worthy cause.
Read the related manifesto HERE.
You see, when 10,000 people make their pledges ...