Starfall is a great educational site for preschool and early elementary-aged kids. It's a site where children can learn to read with phonics. Even though it is a site designed for kids to start learning to read it is very visual and exciting and kids love exploring the different pages. They can click on the letters of the alphabet where they are presented with the letter and it's sound using in an interactive way. They can also learn about the calendar, fun seasonal interactive games, and online books. It is very user-friendly and kids can explore it themselves with little help needed from their parents.
Update: Starfall has added a new section called 'more starfall' where for a small fee you can access new games, songs and stories. It has even added some math to their site. Very cool!
http://www.starfall.com/
