if there is anyone looking to consider a viable organization after undergrad, i think the junior league is one to consider. although it has not been traditionally an african american organization, there are women of color--african american, asian, latina etc who hold membership; this does include me. i know at least in brooklyn, the majority of members are women of color and with my chapter, we do serve 'our' community.
living in the dc area i have been extremely disappointed with the organizations here that profess to be of service. (i am not including bglo's as i am not a member, so i cant speak on what i dont know

). i was a member of NCBW in my area and to put it midly, i was NOT happy with the manner in which the organization was conducting business. it was a shame but a learning lesson nonetheless. the junior league for me as been a great way for me to learn how to effectively serve and develop key skills that can be used in any organization.
so, i say all of that to say that all organizations should be considered if you are looking for one that will give you what you are looking for. to not consider an org. just because 'we' dont have a long standing history of membership may be a bit shortsighted. sometimes we need to step outside of our boxes in order to find a group that will be a fulfilling and hopefully long-term experience.