I found the Web Sight for Kidlink to fit into several categories of the proposed taxonomy.  I feel that depending on the activity chosen to participate in there could be several categories (example: the art gallery is not only medium of expression, but communication as well).  The forum's and projects would seem to overlap media for inquiry & media for communication depending on the activity.  The main issue that I noticed was that with a lot of web based activities, particularly those at this website, comunication would almost be a constant.  The technology promotes communication and inquiry almost simultaneously.  Construction and expression both seem a good fit for the art gallery projects along with communication as well.