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An interesting 'blog from Stanford's Keith Devlin (NPR's Math Guy) who is documenting his thinking as he prepares to offer a MOOC (Massively Open Online Course) on Mathematical Thinking.  This is an incredibly compelling read if you are interested in transition issues from secondary to college, the future potential of online courses, and/or mathematics education.

A mathematical focus, but also great commentary on teacher hesitancy regarding math. Reform is NOT about "high-energy teachers [giving] vague tasks to groups of interested students."

While focused on teaching reading to elementary students, the points raised here apply also to mathematics teaching ... reducing everything to a single way and a single answer is stifling, minimizing, and counterproductive.

A site on project-based learning in mathematics.

From outside the US, but this article (and its link to its opposing article) does lay out one aspect of the mathematics debate that has been raging in the US for decades

"So, learning math is somewhat like learning to read: we can do it, but it takes time and effort, and requires mastering increasingly complex skills and con- tent. Just about everyone will get to the point where they can read a serious newspaper, and just about everyone will get to the point where they can do high school-level algebra and geometry-even if not everyone wants to reach the point of comprehending James Joyce's Ulysses or solving partial differential equations."

"The following images are of black women who are research mathematicians. There are not enough of them, and their talents and abilities are not recognized in the wider community to the extent they should be."

This is a spectacular posting that could be used with ES or MS students (or possibly HS students, too) to explore square roots.

A reflection on the benefit & detriment of the hype surrounding Khan Academy.