Here are some more blogs worth reading. These folks are curriculum people, teacher educators, and other thought leaders in the K-12 education space who are former K-12 teachers. Each is now out of the K-12 classroom, but focused on helping teachers teach and students learn.
Dan Meyer (@ddmeyer)
Subtitle: less helpful
Matt Townsley (@mctownsley)
Blog: MeTa Musings
Subtitle: ...where Math education, Technology and Assessment meet
Jason Buell (@jybuell)
Blog: Always Formative
Subtitle: Assessment is a conversation.
Dean Shareski (@shareski)
Blog: Ideas and Thoughts
Subtitle: Learning Stuff Since 1964
I could go on and on, but I figure I'd keep this list short (for now). Note that I post these links without commentary. You should check them out for yourself. If you know others I should add to my list of must-reads, please send them along.