Along with using minimal pairs, I have started working with his reading skills. D has trouble reading. When I realized this, I immediately began having a reading section in each therapy section. Because he gets frustrated easily, I try to make it fun and short.
I can tell that D is starting to recognize the phoneme-grapheme relationships. He sounds out words, and even though it takes him a while, he can usually figure out what each word says. This confirms what I read in the article, that reading improves with articulation therapy!
Stewart, Sharton R., Gonzalez, Lori S., Page, Judith L. (1997). Incidental learning of sight words during articulation training. Language, Speech, and Hearing Services in Schools (28) 115-126.