One of those useful-to-know tips for entertaining comes from this post on Lifehacker and describes how to quickly chill a bottle of wine:
"Put the bottle in a bucket with ice, water and a large handful of salt. The salt reduces the freezing point of water and will allow it to become superchilled, which will in turn chill the bottle of wine in six minutes flat."
You will find that this process works well for anything that comes in a glass bottle (i.e., beer) and even for aluminum cans.
Another tip that’s sort of related to this — if you have a flat bottle of champagne, just throw in a lemon peel to reactivate the fizz.