Hi Kaotix
The idea is good with a "transparant" lcd.
The problem with a LCD screen is the required backlight.
A couple of years ago I played with taking a lcd apart, trying to make my own projector.
If you remove the background lightsource you will get a transparant lcd.
It's very hard to see the image on this.
You might be able to replace the lightsource with a white paper and a own lightsource with some distance from the paper.
Then the wiimote should be able to see the IR dots on the paper.
Using the whiteboard software with the wiimote behind the screen should be working with a projector.
http://www.wiimoteproject.com/videos-b18/my-whiteboard-retroprojected-on-a-table/msg5305/#msg5305Another way to get a better function could be multiple wiimotes.
If the whiteboard software has this support, maybe they could work together.
Then "blocking the view" problem might be a minor problem.
/Mippen