Two Candles Burn (a audio tape of songs for young children covering most holidays) -- The songs are eminently singable, cheerful, and easy to learn. You might be concerned about the Ashkenazic pronounciation and accenting, but this is easy to change. I especially liked "Let's Build a Succah," "The Wickedest of All," "Seder Prayer," and "Celebrate" for Sukkot, Purim, Pesach, and Shavuot respectively.
Holocaust: An End to Innocence is a website produced by Seymour Rossel, author of many high quality textbooks. This site provides a complete introduction to the Holocaust and its meaning that can be read by students and their parents alike.
Basic Judaism-on-the-Web is another site provided by Seymour Rossel which serves as an introduction to many concepts and issues.