[jyl]

I have one of those vacumn pumps that evacuates the air from the bottle, using a special rubber cork/valve. Then refrigerate the bottle. Works pretty well, an opened bottle seems to be drinkable for a week. It's not exactly at its best after a week - a quite nice tasty red has become an okay table wine - but it is drinkable.

I know someone who uses pressurized nitrogen to do the same thing - replace the air in the bottle with nitrogen. But the vacumn is cheaper.