Davidson Gifted Database - Davidson Institute
http://www.davidsongifted.org/Search-Database
Supporting the Emotional Needs of the Gifted - SENG
http://sengifted.org/
National Association for Gifted Children, NAGC
http://www.nagc.org
Pennsylvania Department of Education - Gifted
http://www.education.pa.gov/K-12/Gifted%20Education/Pages/default.aspx#tab-1
Hoagies' Gifted Education Page
The all-things-gifted resource that you've been searching for. Hoagies' Gifted Education Page offers resources, articles, books and links for Parents, for Educators, Counselors, Administrators and other Professionals, and for Kids & Teens.
http://www.hoagiesgifted.com/
Pennsylvania Association for Gifted Education
http://www.giftedpage.org/
Council for Exceptional Children, CEC
http://www.cec.sped.org
The National Research Center on the Gifted and Talented
http://nrcgt.uconn.edu/