FoodScanner - scan UPC labels on food packages using your iPhone's camera, and this app will find foods and track the amount of calories you have eaten. An useful way to keep daily nutrition counters without having to type in every little detail.
Groceries - a shopping list that can be shared via email. Adding new items is easy and fast, and you can create multiple lists.
Mise en Place - helps you plan meals in advance by telling you what to do when. This could be a very useful app for Thanksgiving menus that require some dishes to be prepared ahead of time. This app breaks dishes up in tasks and shows you which prep tasks you should do, and when.