In the portal you'll find a dynamic textbook, lesson plans, widgets, interactive Demonstrations, and more built by Wolfram education experts. Absolutely a great resource. Builds in representations, applets, explanations of variable use etc. Great tool.
Since it is in Beta, I am wondering how long it will be free and what their plans are for the future.
Interesting classroom management software that is using the social networking model to make classroom commnications stronger. It is in Beta, so I encourage teachers to check it out to see if it adds anything to your classroom environment.