This document discusses various Web 2.0 tools that teachers can use, including Twitter for microblogging, Google tools like Docs and Reader, photo sharing sites Flickr and Picasa, social bookmarking with Diigo, and blogging using Blogger. It provides an overview of how to use each tool, such as how to tweet, find other users, use hashtags on Twitter, and post and manage content on a blog. The goal is to inform teachers about different free online resources they can use both personally and professionally.