Since I know of several national and regional membership organizations relating to video production I thought I'd ask what organizations everyone here might belong to, why you joined and what the primary benefit of membership is for you?

National Press Photographers Association. "NPPA"
Great tips on shooting and editing. Plus they offer workshops, for those of you who have been to Oklahoma that experience is worth it alone. These people are some of the best in the business. Highly recommend especially for newbies. They also offer contests for video and editing. Years back I used to be one of the judges for the southeast region. They a re a top notch organization.