What works for dyslexics works for everyone.

British Dyslexia Society
http://www.bdadyslexia.org.uk/
 
International Dyslexia Society - particularly good for research papers.
http://www.interdys.org/

Educators Publishing Service for Gillingham and much else.
http://eps.schoolspecialty.com/

Pearson for MCP maths.
http://www.pearsonschool.com/index.cfm?

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