I just stumbled upon this Wii whiteboard stuff today and I look forward to trying out.

I was thinking about how you might be able to get the multiple buttons/functions of a mouse on the IR pen. Could a second Wiimote with the cable from the nunchuck be used to power the IR pen and then add buttons to IR pen that takes the place of buttons on the nunchuck and use a bluetooth connection of the second Wiimote for mouse left/right/middle clicks, scrolling, etc...? Then the pen could be used in cursor mode and still have clicks. You could put the second Wiimote in a pocket or strap it to your forearm or hold in the other hand and use it's buttons for other functions.

Rob