What happened specifically with Dragon on the iPad? Was the trouble too many incorrect interpretations of your ds' spoken word or was it clumsy for your ds to use? Has he tried the voice-to-text built into the iPad keyboard?
Seven is young for using voice-to-text. I am not sure of success rates with iPad voice-to-text, but in the re-iPad days I read that many students really didn't take up voice-to-text until after their voice changed with puberty and that it was easier to train then.
Ds has fine-motor dysgraphia, and when he first tried voice-to-text on the laptop he preferred it over typing - BUT -it still wasn't easy for him to train it. Part of the challenge for our ds was that he has a hard time with creative writing also (not just the physical act of handwriting), and he felt weird talking to the computer when trying to train it. The last time we touched base with AT support folks, we were told a good way to train Dragnon is tread from a favorite book, keep reading and ignore mistakes untill you've read for quite a while, then go back and correct the mistakes. We got this advice about the same time ds got his iPad, and the voice databank on the iPad has always worked great for ds so he's never tried training Dragon again.
I don't have the names of any early-elementary apps at the moment, but I know I've seen apps for graphic organizers and apps that include word prediction. DSl uses Pages for word processing and the built-in camera to take pictures of assignments and notes written on the classroom whiteboard. IIRC, there is a list of apps for dyslexic/dysgraphic students on the Eide's Dyslexic Advantage website.
That's all I can think of at the moment, hope it helps a little bit!
polarbear