THIS website is amazing-your child can practice all kinds of math and language arts skills! I highly recommend you try it out!
www.iknowthat.com

ABCya! Kindergarten--great games and activities for many subjects! and FUN!!
www.abcya.com/kindergarten_computers.htm

National Geographic for Kids
www.nationalgeographic.com/kids/

Practice your reading skills here
www.starfall.com

Strategy games, read stories, solve puzzles, and much more
www.windarooss.qld.edu.au/Kids_Pages/kidscorner_nf.html

Spacey Math, Matching Games, Telling Time, Counting, and more...
www.learningplanet.com/stu/kids0.asp

Color a picture while practicing your mouse skills!!
www.niehs.nih.gov/kids/home.htm

Count fish, play checkers, tell time
www.primarygames.com/math.htm

www.livebinders.com/play/play/66930