My ds liked (in addition to what has been said) My Father's Dragon, The Iron Giant, magic School bus chapter books, and choose your own adventure books. He read and re- read lots of graphic novels (to kids on the bus) esp. Secret Science Alliance, Tin Tin, etc.

This year (1st), his interest has gone from science (which he still likes) but currently obsessed with history.

Good luck. I'll be interested to hear what he moves on to.