One of the cool things that they are bringing out for kitchens soon is a dry ice machine that you can use to make really unique desserts. I saw it demonstrated on a show. I guess because the carbon dioxide goes from gas to solid without a liquid phase, dry ice gives off that vapor that looks like steam, so all the people demonstrating and trying the desserts were breathing out big billowing breaths, which the kids really liked.
But mostly they were demonstrating how you could freeze things like custards so that they were crunchy on the outside but still liquid in the middle. I guess that's because it happens so fast that the center doesn't reach the freezing point.