Design21 is indeed a marvellous initiative; for me it acts as a perfect platform in bridging design thinking with the worlds greatest social challenges.

Speaking to members of the Network team, they do assure me the community is steadily growing. I do however, continue to question how powerful individuals, as creatives, feel when they sign up to such online communities - are we really making a difference and using our individual creative skills to help make change, by merely being members to such communities? I feel frustrated as such a passionate communications designer that little "design" or thinking, comes from "signing up" to all these projects.

I have a plentitude of Social Design resources, but here is another one to add to this comment feed:
SocialDesignSite.com