When I crack open a bottle of Stagger Home, there's not much left of that sweet nectar to warrant preserving after a long night of drinking and crossbow hunting. However, if I did want to preserve my vino, I could use the Preservo. This device fills half-empty bottles with inert gas, thereby ensuring none of those nasty accidents like wine oxidization and having your friend puke on your open bottle can ever ruin the next day's crunk.
Looks 'spensive, as well.
Preservo Wine Preserver [ShinyShiny]