History and Overview
Front for the Mathematics Arxiv of eprints section HO: biographies, philosophy of mathematics, mathematics education, recreational mathematics, communication of mathematics.
http://front.math.ucdavis.edu/math.HO

MMOW Mathematics: Modeling our World
The Mathematics: Modeling Our World(MMOW) is founded on the principle that mathematics is a necessary tool for understanding the physical and social worlds in which we live. MMOW is a grade 9-12 core curriculum in which students not only learn mathematics, they also learn to use mathematics.
http://www.comap.com/highschool/projects/mmow/introduction.htm

Association of Teachers of Mathematics
Aims to support the teaching and learning of mathematics by encouraging increased understanding and enjoyment of mathematics.
http://www.atm.org.uk/

Madras College Mathematics Department Resources
Assortment of materials including British Mathematics Olympiad papers and Mathematics Higher Course Notes.
http://www.users.zetnet.co.uk/madras/maths/resources.html

Careers in Mathematics
Association for Women in Mathematics: gives a flavor of some of the areas of mathematics in which there are many opportunities.
http://math.usask.ca/document/netinfo/careers.html

Millennium Mathematics Project (MMP)
A national (UK) initiative based in Cambridge. Its broad goal is to help people of all ages and abilities share in the excitement of mathematics and understand the enormous range and importance of its applications to science and commerce. It aims to change people's attitudes to mathematics, to act as a national focus for renewing and improving appreciation of the dynamic importance of mathematics and its applications, and to demonstrate the vital contribution of mathematics to shaping the everyday world.
http://www.mmp.maths.org.uk/

Centre for the Popularisation of Mathematics
Aims to present mathematics to as wide as possible an audience and to give an impression of the objects of study, methodology, successes and applications, enjoyment, and the wider context of mathematics.
http://www.cpm.sees.bangor.ac.uk/

Alice T. Schafer Mathematics Prize
Awarded by the Association for Women in Mathematics (AWM) for excellence in mathematics to an undergraduate woman who is a U.S. citizen or studying in the U.S. List of previous winners and call for nominations.
http://www.awm-math.org/schaferprize.html

Function
A mathematics refereed journal addressed principally to students in the upper years of secondary schools, and more generally to anyone who is interested in mathematics. It is produced by the Department of Mathematics at Monash University and is published five times a year.
http://www.maths.monash.edu.au/function

Chris Fenwick
Contains research addressing issues in reading-to-learn mathematics, self-organised learning of mathematics and phenomenological perspectives on learning mathematics. Also contains math notes.
http://www.ucl.ac.uk/~uczlcfe