Here is a list of people who blog about mathematics from David Wees (as a Google Reader bundle), or mathematics education. It is incomplete... but will get updated periodically.
Creating learning situations that encourage transfer of knowledge
Two vital lessons.1) Transfer is the bottom-line goal of all learning, not scripted behavior.
2) Transfer means that a learner can draw upon and apply from all of what was learned, as the situation warrants, not just do one move at a time in response to a prompt.
Great hook or connection to the real world for math and current research. Also interesting for enrichment material about exponential equations or prime numbers.
"the more I questioned the wisdom of this rigid requirement. And eventually my message for students changed from you must show your work to you may show your work. Here's why." The goal of showing work is to understand thinking ... requiring showing work may hinder mathematical thinking by emphasizing computation.
"MathleteBlogs.com is a resource for mathematics teachers to connect their math students with peers from around the globe to enhance their mathematical learning experience from K-12."