I have a wonderful book called "What will I do with all those courgettes?" by Elaine Borish, published by Fidelio Press.  ISBN 0952488159.  
 
Quote from the back of the book "A cookery book for a garden full of courgettes.  Over 150 recipes for soups, salads, main courses, casseroles, bread and cake..."
 
I've tried several of them with great success.