(Sample link) National Geographic for Kids http://www.nationalgeographic.com/kids/
coolmath/Math games Click on math4kids,then Math Games http://www.coolmath.com
Starfall - Reading Activities to learn letters, sounds, and sight words. This site has been greatly expanded and has a variety of reading, art, music, etc. http://www.starfall.com
ABCYA - Reading Arts actiities in all areas of skill for different grade-levels. Choose Kindergarten and have fun. http://www.abcya.com
Internet 4 Classrooms Click the books for Language Arts for practice with letters and sounds. Click the numbers for practice counting pennies and learning numbers. http://www.internet4classrooms.com/month2month.htm