Down Syndrome Education International: https://www.down-syndrome.org/
CT State Dept of Education: Bureau of Special Education (BSE) Resources http://www.sde.ct.gov/sde/cwp/view.asp?a=2678&Q=320730
Lots of resources about teaching and supporting social skills, compiled by Nadine Briggs of Social Smart Kids. http://www.kcdsg.org/for_educators.php
Handwriting Without Tears: handwriting curriculum frequently used successfully with children who have Ds. http://www.hwtears.com/hwt
Teaching Math to People With Down Syndrome and Other Hands-On Learners: Basic Survival Skills
by DeAnna Horstmeier. Woodbine House, 2004
"The author, an experienced educator, was inspired to write TEACHING MATH to meet the needs of hands-on learners after observing the difficulty her adult son with Down syndrome and his peers had in applying math skills to everyday life."