This document summarizes 3 tools - Diigo, RSS, and Web 2.0 tools - that can be used in the classroom. It provides details on using Diigo for social bookmarking, including creating accounts, using tags and groups, and highlighting and annotating webpages. It also explains what RSS is and how to find and subscribe to RSS feeds using browsers or readers. Finally, it discusses using various free Web 2.0 tools like YouTube, Flickr and Slideshare and how they can be embedded in class blogs, wikis or other online spaces.