Welcome! Your boy sounds a lot like mine. My son also had an incredibly long attention span from a very young age, soaked in everything we read to him, and started reading spontaneously at 2 1/2. He discovered Magic School Bus at a science museum when he was 2 1/2 and was immediately obsessed. I felt weird reading the books to him at the time because he seemed way too young, but he LOVED LOVED LOVED them, comprehended them, and constantly applied what he learned from them. For example, when he was 3, while I was planting a tree in our yard, he asked me if I was going to dig down to the mantel!
Since then, thanks in large part to this forum, I have learned to embrace his giftedness and just run with it. I registered him for kindergarten when he was 3 1/2, and he entered kindy this past fall at age 4 1/2. He's at a very small private school where each child receives an individualized curriculum and is doing great. The first week of class, he was reading at somewhere around the 5th grade level, so the teacher just worked from there.
If your son was reading at 2, I don't think 3 is too early to start visiting schools. Just try to imagine him "learning" the letter sounds at age 5 1/2!
