Better Chinese: the Chinese literacy textbook we are using this year. You could register to get a free account for several weeks.
http://www.betterchinese.com/Home.aspx
孔子学院 Confucius Institute
http://kid.chinese.cn/en/node_3193.htm
Children Chinese weekly online magzine
http://edu.ocac.gov.tw/biweekly/639/b/p.htm
Online Chinese story：
http://www.yes-chinese.com/feature/child/index.jsp
Chinese games:
http://www.yes-chinese.com/feature/child/index.jsp
Chinese dictionary:
http://www.mdbg.net/chindict/chindict.php
Mandarin Spot:
http://mandarinspot.com/annotate
