first book, probably "captain underpants" when i was 8. embarrasing name, i know, but i really liked it.
although i've obsessed much more over other books since then, when i started reading the daniel x books, i broke my record for not using anything electronic. about 19 hours, 56 if lights and stuff that helped me with my reading don't count.
The Tiger Rising by Kate DiCamillo.
I read it in 5th grade I think and I've read it 5-7x since then. I feel like it had so much meaning in it without really trying. I think thats how books are supposed to feel sometimes though.