I have been reading a really good source of information. MacArthur Foundation has completed a study where they examine superintendents' usage of Web 2.0. It is interesting reading. If you have problems getting to it-you can also search with MacArthur Foundation Study Web 2.0 and you will find the study to read.
http://www.macfound.org/site/apps/nlnet/content2.aspx?c=lkLXJ8MQKrH&b=4294203&ct=6962893