For him? Goodnight Moon, Poky Little Puppy, Corduroy, and Dr. Suess were my childhood favorites. When I got older, I LOVED to read, and I got into sci-fi and fantasy, especially Chronicles of Narnia and the LOTR trilogy (which I firmly believed were best read while hanging out in your favorite tree). Now, I still like the sci-fi and fantasy books, but I’ve also got into mythology quite a bit. I definitely have to say I enjoyed reading more and more as I got older... and it wasn’t until after high school that I discovered this thing called ‘television’ which, to an extent, makes up for the inadequate flow of new books at the local library =)
LOTR is also good to read when sitting in front of a window watching snow fall outside. I remember reading LOTR this way when I was a kid.