Since so many AT providers are knee-deep in Web 2.0...
You might be interested in the following that was just released from the National Center for Technology Innovation:
"Web 2.0 tools are now in use at most schools, and teachers have been largely responsible for making this happen, according to a national K-12 technology survey National Online Survey of District Technology Directors Exploring District Use of Web 2.0 Technologies. But of all the various applications of Web 2.0 technologies, social networking remains the outcast, with the vast majority of districts reporting that few or no teachers engage in this type of communication. The two most significant reasons cited were security concerns and lack of know-how on the part of teachers. According to the researchers, teacher-generated online content will be the "the next area of growth in the use of Web 2.0 technologies." To read more or get a free copy of the study, click here: http://www.nationaltechcenter.org/index.php/2009/05/14/teachers-lead-adoption-of-web-20-but-perceptions-stifle-social-networking/