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Mainly for teachers   

Spartacus Spartacus Educational - an large and outstanding UK website put together by John Simkin, historian and teacher. You can explore the whole site which is mainly about history but also has resources in many other subjects including maths. There are also many links to other educational websites, each with an informative outline.
IMA - Institute of Mathematics and its Applications IMA - Institute of Mathematics and its Applications. A large and very rich site with thousands of links, resources and articles, concentrating on applications of mathematics. Excellent.
The Student Room The Student Room - revision notes on all subjects at all levels. Excellent.
The National Centre for Excellence in the Teaching of Mathematics The (UK) National Centre for Excellence in the Teaching of Mathematics was new in June 2006. It is a government-funded initiative to promote and improve mathematics teaching. Lots of advice, blogs, discussion, resources,etc.
ATM The (UK) Association of Teachers of Mathematics.
Centre for Innovation in Mathematics Teaching CIMT - a large collection of resources, projects and information from Plymouth University UK, aimed at developing new ideas in mathematics teaching.
The Association of Teachers' Websites A site full of contributions from teachers in all subjects and at all levels.
TopMarks A general-purpose educational site.
Sites for Teachers sitesforteachers.com - Top education web sites ranked by popularity.
TES (Times Educational Supplement) A huge collection of links to teaching jobs and other resources.
iSquared Mathematics Magazine A popular maths magazine with a focus on real-world applications of mathematics.
Capita Educational Jobs and Resources A huge collection of links to teaching jobs and other educational resources.