This is the Collaborative Summer Library Program's web-site and provides some excellent resources.

This article discusses what library summer reading programs are like now, and how they can be improved to attract more participants.

A brief overview of the research on summer reading and library summer reading programs.

This is a link to ALA's factsheet on summer reading programs and includes links to research articles at the bottom of the page.

An article about summer reading loss and what can be done to counteract it.