I have been involved with Midlink through my job at NC State, and they have been doing some impressive things in the classroom for over 10 years. The new issue just came out in August, and is just full of possibilities!
Joselyn Todd, one of the midlink editors, has an excellent blog up and is a great example of Web 2.0 in the classroom. She uses wikis in such an inspiring way at her school.
Check her out as well as all the other editors!