The following are some links we think you would be interested in...

The Centre for Education in Mathematics and Computing
The University of Waterloo
Faculty of Mathematics
Wired Math (Free Games and Resources Gr. 7-10, English and French)
Math Frog (Free Games and Resources Gr. 4-6, English and French)
Link to Learning
Ontario Curriculum Documents - Secondary Mathematics (Grades 9-12)
Ontario Curriculum Documents - Elementary Mathematics (Grades 1-8)
Ontario School Boards
Ontario Universities
Ontario Colleges
Ontario Association for Mathematics Education (OAME)
National Council of Teachers of Mathematics (NCTM)
Internet Resources for Math Teachers