Still pondering what to get your alcoholic friends for Christmas? How about the Vinturi, the wine aerator. A double blind taste test conducted by
the company Vinquiry Wine Analytics concluded that "the same bottle of wine treated with Vinturi was higher in overall flavor intensity and mouthfeel."
The whole concept works by exposing more of the wine to air, allowing it to breathe and thus, to counteract the tannins in the wine. Of course, all we know about wine was learned in a 30 minute tour of a winery, so we might not be the kind of experts you're looking for.
Product page [Vinturi - Thanks Ben!]