I checked it out. NACD is founded by Robert Doman, who is the creator of Brain Builder, co-creator of The Listening Program. I don't know exactly what they do at NACD, but I did take a workshop for The Listening Program. It is another version of auditory stimulation, like the Therapeutic Listening program that I use in therapy. The difference is just a matter of preference, I suppose.
Robert Doman's son, Alex Doman, runs Advanced Brain Technologies, which sells and trains people in The Listening Program and other computer based/auditory interventions. But it sounds like NACD does the auditory stuff and more. Just be a wary consumer.
If anyone wants some info on the differences between the programs, let me know. Having been trained in both programs and used both programs with clients in the clinic, I have a preference for Therapeutic Listening. It is more flexible, individualized and "gentler" I think, than The Listening Program.