Have you heard of Book Adventure? It's an online reading program created by Sylvan Learning. If you have AR (Accelerated Reader) at your school it's somewhat similar except it's FREE and has so many more cool features!
First, as a teacher you can go in and create a class to include all of your students. You can create teams which would be great for different reading levels. I especially think upper grade levels can use this particularly if you are departmentalized and have several classes. You can create contests with students as well as create incentive plans. Teachers can also set up booklists. How awesome, right?! The incentives for kids are very kid friendly- temporary tattoos, candy bars, books, etc. There are online quizzes for more books than you can think of and new quizzes are added. Teachers can even create quizzes!
The site includes very cute mascots like Rex Reader and Bailey Bookmark that I know my first graders will fall in love with. There are tons of resources for teachers as well as parents. AND parents can join Book Adventure too and set up an account for their child.
And seriously people- IT'S FREE! Our school cut Accelerated Reader out of our budget because it was thousands of dollars. I know you're all too familiar with budget cuts. But I really think this program is much better than AR and certainly more appealing to children. Go check it out and set up your free account for the new school year!