Mixed Race Organizations:

The Association of MultiEthnic Americans (AMEA)
Mavin
Multiethnic Education Program
The ME Program provides educators and families culturally competent resources and strategies (including publications, trainings and videos) to ensure mixed heritage children thrive in our increasingly diverse society.
Swirl
Hapa SC (USC's Mixed Race Club)
UCLA Hapa Club
The Topaz Club
Jewish Multiracial Network

Mixed Race Websites:

Mixed Media Watch
Eurasian Nation
Melting Pot Gifts
Cards and Gifts for the Interracial Community
Loving Day
Loving Day celebrates the legalization of interracial couples with nationwide events and provides free educational resources.
Mix It Up
Asian Parent
Includes articles about multiracial Asians in its "Playground" section.
Elizabeth Atkins Blog
Blog by the author of several books featuring mixed-race characters.
Multicultural Kids
Mixed Chicks Chat
The only LIVE weekly show about being racially and culturally mixed.