Supporting Early Literacy in Natural Environments - this is a great document to use with parents to encourage Interactive Literacy in the home and other natural environements. The following link will allow you to download and print the manual. http://www.walearning.com/Parent-Preschool.html
Making Kids Mind Without Losing Yours -this is a series by parenting author, Kevin Lehman (author of The Birth Order Book). DVDs and workbooks are included. Many of the PERC in the county school systems have this series.
Weekly Reader for Pre-K This would be a nice, inexpensive way to introduce non-fiction materials.