Most cuisines have examples of cooking with grapes - from curried chicken salad (or uncurried as well) to sole Veronique. Aside from eating them plain - are grapes worth the effort to make a part of everyday food?
Nutritional value of grapes
This is a great looking recipes and story about cooking with grapes...pork tenderloin with roasted grape sauce.
Pickled grapes are wonderful too. The first time I made pickled grapes --a little too much on the spicy hot side! But they are great as a condiment and a cocktail nibble.