We tried some of the younger kid Choose Your Own Adventure books when dd10 was younger and had stamina issues with longer books. I don't know if they, too, might be a bit of a stretch, but they can be quite short. (These are not the thicker ones that are written more at a 4th-5th grade level.)

http://www.amazon.com/Haunted-House...mp;ie=UTF8&qid=1316107095&sr=1-4

Dd13 made a huge leap when she was at the spot your ds is in reading. She went from Henry and Mudge to Harry Potter in a matter of weeks.


Study Strategies for Accelerated Learners