Cool. I can't take credit for it; I learned it 25 years ago in a cognitive psych class. And it goes back a couple thousand years more and is also known as Method of loci or Memory Palace.
http://en.wikipedia.org/wiki/Method_of_lociI'll be curious if it works for him as it may play right to his strengths. Making interesting pictures is an important part of it. Around 10 locations is a good start and the same path can be used for different lists. I find it easiest to briefly close my eyes as I put something in place. I taught it to my DS7, and he was surprised when he remembered 9 of 10 things I had him place the very first time.
