Links to check out:

http://www.studyisland.com

http://www.usmint.gov/kids/index.cfm?fileContents=games

http://www.saxonpublishers.com/activities/index.jsp

http://www.coolmath4kids.com/

http://www.edu4kids.com/

http://matti.usu.edu/nlvm/nav/grade_g_1.html

http://www.nps.gov/yell/home.htm

http://www.yellowstone.net/

http://yucky.kids.discovery.com/

http://www2.lhric.org/pocantico/charlotte/index.htm

http://www.murrieta.k12.ca.us/alta/grade3/charlotte/

http://www.sdcoe.k12.ca.us/score/charl/charlsg1.html