Extension of Search Capabilities
Im sure this is somewhere on someone's list.
I was reading through posts this morning and responded to someone regarding searching through the food database by "type" of food. The "Ask the Oracle" functionality kind of already handles some of this by allowing you to search by nutrient types, pulling up options for vegetarian/vegan diets, or excluding certain types of foods (Seafood, nuts, etc). However, it does not seem to really categorize foods in any way. Categorization could be somewhat subjective, too, so I can see how this might not be an exact science. But you could always use the concept of tagging, so that food items get certain tags as they're entered. Of course, there are other ways you might want to search for foods/recipes too, such as maybe foods used/logged in a date range or something.