This document discusses Web 2.0 and its tools that can be used for teaching and learning. It provides an overview of blogs, wikis, social networking, social bookmarking, podcasts, videos, and other collaborative online tools. The document emphasizes that Web 2.0 sites are services to get things done with other people rather than just online places to visit. It also suggests that as the web changes, so will teaching to become more dynamic, outward-facing, and community-oriented.