I'm currently using a book called "teach your child to read in 100 easy lessons" with a ND almost 4 yo. The lessons are super short and easy. About the time he wants to quit, we're done.
The only prerequisite is knowledge of letter sounds, that's it.
I have this book too, and second the recommendation for it.
Unfortunately, I wanted to teach dd with this book, and she wanted to learn, when she was around 3, but...as we later learned, she's majorly a VSL and couldn't blend the sounds, so it ended as a very frustrating experience. Instead she needed a more whole word approach, at least when she was younger (too bad I didn't understand that until we had her tested at age 6). She didn't really pick up phonics well until the middle of first grade - long story - and by that age, once she figured it out she didn't really need a lot of specific instruction, at least not above what she already got at school. I keep hoping I'll be able to use that book with one of the younger kids LOL...we'll see.
