This document provides 21 tips for teachers to create a 21st century classroom using technology and Web 2.0 tools. It emphasizes developing students' literacy in finding, validating, synthesizing, leveraging and communicating information through collaboration. Tips include using tools like Delicious, Gmail, Google Docs, Jing, online learning environments, and Web 2.0 applications for creativity, productivity and bringing the global community into the classroom. The overall goal is to transform the traditional classroom into a digital, collaborative learning environment that prepares students for 21st century skills.