Here are some links to preschool activities that your child may enjoy.
Fisher-Price Little People offers games for preschoolers. http://www.fisher-price.com/fp.aspx?st=30&e=gameslanding
Starfall allows your child to explore the alphabet. Simply click on the ABCs link to allow your child to practice with phonemic awareness. http://www.starfall.com/
Chateau Meddybemps offers a parent's guide along with online activities for your child. http://www.meddybemps.com/preschool.html