Casual Kitchen has a ton of links in this post: A Recession-Proof Guide to Saving Money on Food.
I've also recently picked up this book: The Frugal Family's Kitchen Book by Mary Webber. What an excellent book! It's more than a cookbook, which is why it's called a kitchen book. It deals with all kinds of money-saving strategies. If you know a young person or young couple just starting out on their own, this book would be an excellent gift!