The document provides seven tips for using 3D virtual worlds like Second Life for teaching and learning. The tips are: represent students with customized avatars; use it as a community space rather than just copying a real campus; start with concrete representations and allow abstract thinking to develop over time; adopt the tools gradually through various stages; don't hire professionals to do work for students; leverage the existing network of educators in these spaces; and either embrace the technology or ignore it, but don't dismiss its potential.