I agree with Dawna that Joanna Lunds cookbooks have very good low calorie casseroles. One cook book is Cooking with Kids in Mind and another is Cooking with a Man in Mind. There are plenty of others. Try your library for a sample of her books.
she has a web sit with recipes, a great archive section and a message board with lots of recipes.
www.healthyexchanges.com
You also can probably find her cook books on
www.half.com for sale at a reasonable price. On her website she offers them all plus a monthly newsletter that is very interesting.