Social Studies
http://www.internet4classrooms.com/kplus_alpha.htm
http://www.kidport.com/gradeK/LanguagesArts/LanguageArts.htm
Math
http://www.bbc.co.uk/schools/digger/5_7entry/5_7.shtml
http://www.scholastic.com/earlylearner/parentandchild/math/pattern.htm
Science