If you desire to encourage reading then this free online Accelerated Reader program may be for you.
When Jaden went to public school, he had the opportunity to participate in the school's Accelerated Reader program. (If you aren't familiar with how AR works, this is a basic run-down: the student reads a book, takes a multiple choice quiz to determine comprehension, and then earns points based on his score. At Jaden's school, kids who earned a certain number of points by a specified deadline were allowed to go on a special field trip.)
When we started homeschooling, I tried to find a similar program that we could participate in from home. In my search, I came across Book Adventure (a website created and maintained by Sylan Learning Center). It's quite similar to Accelerated Reader, and it's totally free. The kids can earn real prizes with their points, and parents can even create their own individualized prizes that can be posted on their child's Book Adventure account when their child sign's in.
Here's Book Adventure's description from their site.
Book Adventure is a FREE reading motivation program for children in grades K-8. Children create their own book lists from over 7,000 recommended titles, take multiple choice quizzes on the books they've read, and earn points and prizes for their literary successes.
It's definitely worth checking out!