Yesterday we witnessed something amazing: C is able to sight-read some words, and then match them to images. (This is the first time C has done this exercise with his ABA therapist; ironically, the point of the exercise was to help him with fine motor skill such as holding paper, not reading.) These are words C likes to spell, so he's already familiar with them. Nonetheless, he's seeing the words out of context and attaching meaning to them. In other words, pre-reading.
I know that when I tell people about this, some of them will think, "Well, there's more proof he's smart and maybe just a little unusual." It can be frustrating having to constantly explain that, yes, my son has some abilities that are beyond his 3.25 years of age, but in other areas he has severe deficits. People tend to assume average to better-than-average cognitive abilities mean there are no serious problems.
Nonetheless, I am thrilled with this development: it is heartening to know that despite the deficits, he has a great brain hard at work.