Storyboard that--looks like a great free online story board. Would work well with graphica, free and educators can set up their private classroom accounts.
You can set up online meetings with Ohours--open office hours. I see lots of potential here for online meetings.
You can also meet other people, which doesn't seem to me to be terribly helpful...whatever.
Grockit is an online social learning community--good for test preparation for SAT, ACT, GRE etc. Of course, they are trying to get you to purchase theiri online test preparation program. Might be helpful to persons working with secondary learners.
Online magazines for children and middle schoolers. Good listing, though there are some costs associated with magazines. Might be beneficial to get 'class' magazines rather than hard copies.