I always try to polish off what is left in a bottle. Serious wine drinkers feel that leaving half a bottle or a little bit of wine is a crime. Many people use gadgets attempting to conserve the elixir of the gods. Restaurants and some households practice this aberration, but it never tastes quite the same. After countless experiments, I've come to the conclusion that the closest to the best solution if you cannot finish off the bottle, is to cork it and refrigerate it.
The humane thing to do is not to leave even a drop!