Greenelle's Numbers http://www.sheppardsoftware.com/preschool/ngames/numbers.htm
Starfall - Learning letters and Reading Strategies
Nick Jr. - Benefical games using the students favorite characters.
PBS Kids - A lot of information that can help your child learn and review necessary skills.
PlayHouse Disney - Numerous games to help your child review and build fine motor skills.
Seussville - A whole site dedicated to learning about one of the world's favorite authors.
Mouse Skills - Games used to help with Mouse Skills