BOB Books, sets of beginning phonics based readers, are helpful for developing reading skills. The first five books build skills, each set of books building on the skills learned in the previous set. A set contains 8-10 readers and/or activity books. They follow pretty closely the skills being taught in the California Treasures reading program in the first grade. The stories are not great literature but they can provide the just right books a beginning reader needs.
The Sonoma County Library has sets of the BOB Books. Costco carries them and they are available through Scholastic. For more information about the books and how to use them go to the BOB Books' website.