A couple of blogs I've found lately and added to my reader:
1. Simplifying Radicals - a high school math teacher who has some interesting things to share (like a Bazinga game, using red/yellow/green pens to grade, etc.)
2. Infinite Sums - an engineer-turned math teacher who uses SBG and has oh so generously posted all of his Algebra 2 and Precalc materials online (woo hoo!)
Check them out!