Today I would suggest you to spend one hour watching an excellent documentary about "The magic of unconscious", in catalan here until Jan 9th, and in english here.
Cass Sunstein recently has published the short guide to nudging and those interested in any concrete application should look at these ten tools:
1. DefaultsWether they may work or not depends on the details and environment. The hardest task.
2. Simplification
3. Social norms
4. Increases in convenience
5. Disclosure
6. Warnings
7. Precommitments
8. Reminders
9. Eliciting intentions
10. Informing people of the nature and consequences of their own past choices.
