I saw this Dan Meyer TED Talk on re imagining Math through problem solving. I like how he takes a problem from the textbook and makes it more rigorous.
"Today's math curriculum is teaching students to expect -- and excel at -- paint-by-numbers classwork, robbing kids of a skill more important than solving problems: formulating them. In his talk, Dan Meyer shows classroom-tested math exercises that prompt students to stop and think. (Filmed at TEDxNYED.)"
This is a list of teachers, coaches, and educators involved in the Math Twitter Blogosphere. The MTBOS is an extremely active and rich community of individuals looking to improve and refine their own math instruction. This document contains an excellent collection of blogs and twitter handles worth sharing with your math teachers.