http://Tutpup.com is another educational gaming site where you can compete with other students around the world.  Teachers can create classes to group their students.  there are a wide variety of activities, and even the spoken pronunciations for the spelling game are good.

http://www.arcademicskillbuilders.com/ is a collection of Flash-powered, graphically-pleasing, engaging math and language arts games for elementary students. Most of the content is math but language arts is represented too. Players choose a name when the game begins – no messy site registration is required – and they are off and playing in no time!