Starfall is a great website for working on learning letters of the alphabet. Parts of the website are free, but you can also purchase a membership and have access to colors, songs, and other literacy and math activities.
PBS Kids is a fun, educational website with games and activities for young children.
Disney Junior is a simple site designed for young kiddos with familiar Disney characters from Little Einsteins, Handy Manny and Mickey Mouse Clubhouse.
ABC Mouse is a great website that we use in our classroom sometimes and the kids use in the Computer Lab. Kids can work individually on various skills at their own page. It includes both Math and Literacy activities. They also have many activities you can print and use at home. It's very useful! This website does require a membership fee.
Your child can listen to books online at these two websites:
Also, KinderTown is a great website for educational apps to put on your phone, iPad or tablet!