Brian Crosby, our featured educator in this week's "Teachers at Work" column, reads these blogs dedicated to innovating in the classroom:
Borderland by Doug Noon
Speed of Creativity by Wes Fryer
Mark's Edtechblog by Mark Ahlness
Around the Corner by Miguel Guhlin
Room 208 by Bob Sprankle
Finally, this is not a blog, per se, but Brian also recommends checking out National Library of Virtual Manipulatives for additional teaching resources.