They have online books and activities the kids can do as well as printable worksheets for coloring and writing practice offline. The methods used to teach reading are compatible with how most public schools will teach. Read more about this site in a letter to parents here.
My girls absolutely love this website. The 4 year old learned how to use a mouse on this site (with the help of mom and big sister) and now whenever I need quiet time to myself I let her play here. The 6 year old spends lots of time reviewing the sounds and word families she's working on in class. It is a great resource for all.