Here are a few interesting links

Math Links

http://www.321know.com/g31e_px1.htm

http://www.factmonster.com/math/flashcards.html

http://www.aaamath.com/plc31-placevalue.html

 http://www.quia.com/mc/66061.html

Language Arts Links

http://www.manatee.k12.fl.us/sites/elementary/palmasola/rcdowni3.htm

Social Studies Links

http://bensguide.gpo.gov/ (great site for government)