Prongo.com- http://www.prongo.com/ 

• Educational games divided into age level:  3-6, 6-9, 9-12.  Prongo.com has free online games, quizzes, clip art, e-cards, wallpaper, kids jokes, screensavers, and more.
  

FunSchool - http://www.funschool.com/ 

• The site offers more than 300 interactive games and activities for preschool through 6th grade that are fun, easy-to-use, educational activities ranging from matching numbers and shapes for pre-schoolers, to geography, math and history for third through sixth graders.

Zeeks - http://www.zeeks.com/ 

• A favorite of Internet-savvy families with more than 250 different games, activities, crafts and lessons, Zeeks entices users, keeping kids, parents and teachers endlessly entertained.

Fun Brain - http://www.funbrain.com/

• Great online math and word games for elementary and middle.  Also includes teacher resources. 

Primary Games.com - http://www.primarygames.com/  

• This site contains educational games for elementary students. Games will be added throughout the year, so be sure to bookmark this page and check back often!

• This site is targeted at middle school and pre-teen students.  It is a virtual city complete with its own currency that students early playing educational games.  Teachers can register and manage student accounts.  The site says this:  "Inside Whyville, citizens learn about art history, science, journalism, civics, economics, and really so, so much more. Whyville works directly with the Getty, NASA, the School Nutrition Association, and Woods Hole Oceanographic Institution (to name just a few) to bring incredible educational content to kids in an incredibly engaging manner."