Third Grade Rocks!
Brainormous:
http://www.brainormous.com/online/loader_multiflyer.html
Dance Mat Typing:
http://www.bbc.co.uk/schools/typing/flash/stage1.shtml
Job Land:
http://paws.bridges.com/cfnc1.htm
Tumble Books:
http://www.tumblebooks.com/library/asp/home_tumblebooks.asp