If you like "Unplugged" then you may be interested in the following.
The MegaMath project .( http://www.c3.lanl.gov/mega-math)
Some of the "Unplugged" material is being distributed in cooperation with NetSchools (http://www.netschools.org/) and the Humanity CD-Rom Project (http://www.oneworld.org/globalprojects/humcdrom/). There is a mirror of the New Zealand site (http://unplugged.canterbury.ac.nz/) at their European site (http://www.oneworld.org/globalprojects/humcdrom/unplugged/).
If you are reading this information from a CD, you should check out the live version on the world wide web (http://unplugged.canterbury.ac.nz/).