The Throne of Fire by Rick Riordan - #2 in the Kane Chronicles. "...a tight action-packed tale filled with cinematic monsters, mythological battles and an impending apocolypse." (Amazon review)
or try
2030: A Day in the Life of Tomorrow's Kid by Amy Zuckerman and James Daly.
"A talking dog, a housecleaning robot, and a three-dimensional "data-orb" are among the many cool features that kids might enjoy in teh future, according to this light-hearted look at 2030."(Amazon review)
