Doing what works is dedicated to helping educators identify and make use of effective teaching practices. Offers developmental on line workshops. Currently there is a workshop on how to help girls do better in math and science.
This is an interesting organization. It provides professional development resources and workshops for educators. They have free resources for journals and some interesting commentary on student assessment. The founder of this site is Grant Wiggins. I'll be doing some more research on him.
Math lessons for high school and middle school. These lessons have been writen by teachers who participated in SCORE Mathematics workshops and is designed for teachers in California but are correlated to the NCTM standards.