"IxDA is a novel kind of “un-organization” in that there is no cost for membership. IxDA relies on its passionate members to help serve the needs of the international Interaction Design community. With more than 50,000 members and over 140 local groups around the world, the IxDA network actively focuses on interaction design issues for the practitioner, no matter their level of experience"

Read more at http://www.ixda.org/