Math
Tools for Learning and Teaching (worksheets, manipulatives, games, graph paper, etc)
Worksheet Generators and Printable Worksheets:
Other:
Math problem of the week: http://learninglynx.blogspot.com/2011/10/math-problem-of-week.html
Fun math videos: https://www.youtube.com/user/numberphile/videos
Huge number of resources of all types here: http://wheresthemath.com/parents/math-help/