They are fun and safe websites.
Create Comics with Make Beliefs Comix - online Comic Generator for Kids of All Ages
Zoopz - Games that make you think
Primary Games
Math Games for Kids - including brain teasers and puzzles
Fantastic Contraption - a fun physics game
Line Rider- Create a track for your rider to ride's tricky, don't make it too steep or he'll fall!
Fun 4 The Brain
Games for Your Brain
Computer Lab Favorites from Scholastic
World Almanac for Kids - Check out the "Explore" link first!
PBS for Kid's Cyberchase Games
Magnetic Poetry
Funbrain - Great games for math practice, reading, and most other subjects
100 Interactive Educational Games
The USA game - practice locating states
Room 108 - Educational stories and games
Skills Practice for every grade level- tons of interactive activities that are aligned with curriculum goals
Family Education Network - Games, software, activities
Mighty Books - online reading, games, and activities
Story Place - English and Spanish books, activities, and reading lists
ReadWriteThink - click on Student Materials for lots of interesting activities like creating a comic strip
Academic Skill Builders - for Math and other topics
e-Learning for Kids - Lots of basic skills in all topics; math, science, etc.
ABCya! Educational games for K-5
Create a GeoGreeting - find out more about geography too! - is a weekly newspaper feature and Web site produced at the University of Kansas by a team of teachers, offering lots of good quality, safe sites

Don't just play games! Create games!