www.nomotc.org
National Organization of Mothers of Twins Clubs, Inc.
The nationwide association of clubs and a primary source of information about multiples.  If you don't live in Connecticut, find a club in your area here!

www.multiples.about.com
Great general information about multiple births and raising multiples.

www.mostonline.org
The national nonprofit support organization dedicated to triplets and higher order multiples.

www.tttsfoundation.org
A national nonprofit organization dedicated to raising awareness about TTTS (Twin-to-Twin Transfusion Syndrome).

www.igive.com
Support the state organization using the shopping sites you already use!