Got kids who need a little help with reading? Try some of the suggestions you'll find at Starfall. The site was launched thanks to a former reluctant reader and so effective it made the education section of Time magazine's current 50 best websites list. Visit the site to find free (yes, free!) fun and games and a good shot at reading improvement. Recommended for K-2nd graders.
Got over-achieving readers? You know - the 4th-grader who can handle any adult title, but maybe not the context? Librarians can be your best source of recommendations. Don't overlook those "older" titles, like The Phantom Toll Booth and Stuart Little. Vocabularies have changed a bit over the past few decades - enough to slow down a young (eager) reader and to teach a few new words along the way.
They'll thank you when it's time to take the SAT.