Web 2.Perfection
Web 2.0 Backpack: Web Apps for Students
This recent article is a really great resource for getting folks into those 2.0 apps.
You can also check out the wiki textbook my 2D Foundations summer students made (link below) as another example of using Web 2.0 in the classroom.
I apologize if the blog runs a little slim this summer. I’m having my second child and taking a needed break 
