When I saw the Frog and Toad, I remembered posting about my DS's first books. A search brought up this thread:
When do you consider your child a reader?

I know there are other threads out there, too, if you feel like searching.

My kiddo always liked to be read to as well, and it took a while before he would pick up a book and read it by himself. He grudgingly would when he was 5 in kindergarten and he had some reading logs. Now at 7, he's reading all kinds of stuff. Currently he's on a math kick, so it's "The Number Devil" and "Life of Fred."

Here are a couple of threads for your "milestones":
What is your first grader reading?
What is your 10/11 year old reading?