If you have any suggestions, then Bill Barton (b.barton@auckland.ac.nz) would be delighted to hear from you. (He is looking for teams of people to write, in a way that would be interesting and comprehensible to schoolteachers, on such subjects as geometry, algebra, analysis, combinatorics, probability, etc.) If you follow the link above, you will find that there is also a wiki that they hope will