It's nice to see a publication like this made freely available. The book is an overview of Web 2.0 technologies for educators and features contributors from a number of people with expertise in the field. This is one of those projects that is good for everybody - readers get a valuable reference, while the contributors benefit from the exposure and the networking that such a project supports. More information is available here - note that the navigation on this page is to the left and is a bit difficult to use. Anyhow, my congratulations to everyone involved.