Oh man, Baby-Sitters Club. I tore through those faster than they came out, haha. I remember when I first discovered them, back in third grade - I asked the librarian at my elementary school if we had any Baby-Sitters Club books, and she handed me one of the Baby-Sitters Little Sister books, thinking it was more my reading level. Apparently she never got the memo that I'd been reading at a 7th grade level since kindergarten. :P I actually felt a little insulted that she gave me such an easy book!