I like certain web sites and hope you would like to try them with your children at home.
My favorite is: www.starfall.com We use this website at school in Computer class and the kids really love it!
Others Include:
www.timeforkids.com/TFk/class/pdfs/2004S/040319BP8.pdf
http://www.kindernetonline.com
http://observe.ivv.nasa.gov/nasa/earth/seasons/seasons1.html
www.ABC Mouse - free for teachers. Fee required for this one for parents
ABCya.com