Stephen Downes

Wolfram's announcement was drowned out in the iPad hysteria: "e are pleased to offer the best of all of our technologies to you here in the Wolfram Education Portal, organized by course. In the portal you'll find a dynamic textbook, lesson plans, widgets, interactive Demonstrations, and more built by Wolfram education experts." You'll need to download and install a viewer, but this is pretty painless and the results are worth the effort.