I don't know the age of the child or specific level you mean by "early reading." My six year old is reading the Magic Treehouse series by Mary Pope Osborne like crazy right now. As a teacher, I tend to think of these as rather junky, "formula" type books (in the series, they're all pretty much the same) but they interest young readers because the sibling travel to all different geographical locations and times in history, and there is a little non fiction learning to be had in addition to the adventure aspect. But, if you're talking a 4 year old just learning to read, I second BOB books...the Magic Treehouse are easy-ish chapter books.