Ever have the issue with drinking only a glass of wine and then forgetting about it and turning the rest of the bottle into vinegar?
Meet: Coravin -- a device that allows you to pour a glass without removing the cork.
It works like this: A thin, hollow needle is pushed through the cork to inject argon gas into the bottle. The gas pressure forces wine back up through the same needle and into the glass, while preventing the rest of the bottle from oxidizing. When the needle is withdrawn, the cork reseals.