Hi, Harley...
There are a few support groups in the New York area for both adoptees and birthparents. I know that Adoption Crossroads is a popular one:
Adoption Crossroads
444 East 76th Street
New York, NY 10021
Phone: (212) 988-0110
Fax: (845) 267-2736
joesoll@adoptioncrossroads.org
http://www.adoptioncrossroads.org/
You can search for other support groups by visiting
http://www.childwelfare.gov/nfcad/. They have a cool search feature that I've found really useful. Good luck!