WiiLearn

"Edusim is a free opensource 3D virtual world specifically for your classroom interactive whiteboard. Edusim is a powerful way to engage your students by bringing a 3D virtual environment that allows direct haptic manipulation of the 3D virtual learning objects directly from the interactive whiteboard surface."

This software connects the motion, infrared, and traditional buttons of the Wii remote with a Windows PC. It can control the cursor, keyboard buttons, and other interface options. Pair this software with some fun flash games, and you're giving the Wii console a run for its money.

Not exactly educational, but it's free content for the Wii throug the internet channel.

This notetaking app could be useful for interactive whiteboard work.

This screenshot utility may provide the functionality needed for a fully interactive whiteboard

Another screencapture tool to try out with wiimote whiteboard. Looks solid