Cacoo is a user friendly online drawing tool that allows you to create a variety of diagrams such as site maps, wire frames, UML and network charts. Cacoo can be used free of charge. Collaborating is as easy as sharing a link with others.
This document summarizes for the novice about twenty Web 2.0 tools. It describes what each tool is, shares how to use it, and provides educational ideas for its use. From Blogs, Diigo, and Flickr to Ning, Wallwisher, and voice thread. The document is a guide and is easily searchable.