Progressive Phonics is a free series of ebooks that teachers and parents can use to help their students learn to read and write. Progressive Phonics offers free ebooks that cover everything from learning the alphabet to learning to write to learning the construction of words and sentences. As the name implies, Progressive Phonics arranges the series of free ebooks to build upon each other. You do have to register for the service, but once you do you can download the ebooks.
Progressive Phonics could be an excellent free resource for anyone tasked with teaching children how to read and write. The directions for the activities in the books that I downloaded appear to be very clear so as to very accessible to young learners.
Here are some related items that may be of interest to you:
Seven Places to Find Free eBooks
Google Books Adds Shelving Options
Embedding Books Into Your Blogger Blog or Google Site