The very first post answers your question, at least as to the "why."

Frozen grapes are one of the great treats - I buy fresh ones, wash and freeze them and snack on them later. They have an interesting consistency and they are very refreshing.

Costco sells a 4 lb. bag of frozen blueberries, blackberries and raspberries. They're great, as described above, for smoothies. They are also great for baking. I nuke them briefly and enjoy them on cereal if don't have fresh berries handy. I also throw them in fruity drinks - better than ice cubes. You can also thaw them with (or without) a little sugar and use as a great sundae topping.

My mother used to freeze fruit (especially apples and peaches - washed, peeled and sliced) for later use in pies.