Educational computer games for kids

Here are some good educational games for your younger children.
I'm not into having my kids sit on the computer, however, when I do I just limit my children to 20 minutes a day.
It's good for those chaotic times in the evening to keep them occupied.
It's helped my 4 year old to learn her letters and their sounds.

http://www.starfall.com/

http://pbskids.org/

http://www.learninggamesforkids.com

http://www.funbrain.com/index.html

http://www.tvokids.com/

http://www.ictgames.com/resources.html

http://www.nickjr.com/

http://www.bbc.co.uk/cbeebies/

http://www.kidsspell.com/

http://www.speakaboos.com/