Thank you for the responses. We've never done any instruction with him; he just started reading on his own. So, he doesn't know how to sound out words. So far when he came to a word he didn't know (very few), we just told him what it was. That's why I'm asking about reading/phonics programs. I honestly wouldn't know where to start. If I ask him what sound a letter makes, he looks at me like I'm crazy and tells me I already know. I will start asking him to try sounding out more complex words and see where that takes us. We read to him everyday. He reads to us and to himself. He never gets tired of reading.

My four year old has been reading for a few years now. He loves the Frog and Toad stories, and can easily read above that level. We're going to start "school" next year when he's five. My question is should we start a reading curriculum with him, like 100 Easy Lessons? I'm not sure how or if we should try to teach him reading and phonics since he already reads so well.