Association of Mathematics Teacher Educators http://www.amte.net/
A non-profit organization created to promote the improvement of mathematics teacher education in all its aspects. Based at the Center for Research in Mathematics and Science Education, San Diego State University.
Center for Mathematics, Science, and Technology http://www.ilstu.edu/depts/cemast
Purpose of group is to help in the advance of learning and teaching of mathematics, science, and technology so that students of all ages can thrive in a technological world. Services includes educational modules and school scholarships. Located at Illinois State University.
Clay Mathematics Institute http://www.ClayMath.org/
Sponsors events for talented high school students, professional symposia, and diseminating new research news in the field. Includes goals and details of ongoing projects. Located in Cambridge, MA.
Math for America http://www.mathforamerica.org/
Working with teachers, school administrators and other stakeholders to improve the quality of mathematics education in US public schools. Details of Newton Fellowship program.