In this article, the author talks about the 3D virtual world known as Second Life and its potential as a learning platform. In the last few years, many colleges, universities, and libraries have established resources in what has become the preeminent multiuser virtual environment. Today, more than 100 Second Life "regions" are used for educational purposes. Since it was launched in 2003 with one square kilometer of virtual real estate, Second Life has become an international phenomenon, having grown into a 600-square-kilometer world with 6.9 million registered users and between 30,000 and 40,000 online "residents" who explore the space in the form of avatars, buying and selling goods, clothing, avatar attributes, and property, and participating in individual and group activities. Thus, lauded as a learning tool, the popular virtual world is now being used by teachers for their own enrichment, providing them with a wealth of opportunities for collaboration, peer interaction, and sharing of resources.