This document discusses how virtual world technology can be used to deliver effective, efficient, and inexpensive health improvement programs. It provides background on employer-sponsored health programs and how they have been shown to reduce costs and improve productivity. Virtual worlds allow for real-time communication and social networking in immersive 3D environments. The company HealthyWorlds is exploring how to use virtual worlds to provide health seminars and self-directed learning modules to engage users. Virtual worlds have potential applications in health education, care delivery, and simulating patient experiences.