Support and Advocacy Groups
Research Organizations
National Down Syndrome Society
Down Syndrome Association of Westchester
National Association for Down Syndrome
National Down Syndrome Congress
Uno Mas! Down Syndrome Online
Adopt-A-Mouse for Down Syndrome
Center for Research and Treatment of Down Syndrome -- Stanford University Medical Center

Down Syndrome Research and Treatment Foundation

Adopt a Mouse for Down Syndrome

Adult Down Syndrome Center at Advocate Lutheran General Hospital, Park Ridge, IL

Cedars-Sinai Medical Center, Los Angeles, CA
 
Eleanor Roosevelt Institute at the University of Denver, Denver, CO

The Jane and Richard Thomas Center for Down Syndrome, Cincinnati, OH

The Johns Hopkins University School of Medicine, Baltimore, MD

The Kennedy Krieger Institute, Baltimore, MD

New York State Institute for Basic Research in Developmental Disabilities, Staten Island, NY

University of California at Irvine, Irvine, CA

Waisman Center at the University of Wisconsin, Madison, WI

Miscellaneous
CareCircle
Down Syndrome.com
(a comprehensive list of DS sites on the web)

Links
T-21 Club (Down Syndrome Awareness Products)
Troy's Boys & Girls