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 for role-plays and simulations to make concepts more concrete initially before fading to abstraction; adopt uses gradually from passive to active engagement; don't rely on professionals but do the work yourself; leverage existing communities of educators; blended approaches may work better than full immersion; and leverage asynchronous tools as well as synchronous sessions.