Well, I tried to keep out of this thread for fear of being branded a snob, but I gotta admit some of you know your shi't much better than I do.
I'm not a huge fan of drinking wine for the sake of drinking wine. And I only drink non-French wines when I'm at a party/dinner and don't want to be rude. But otherwise, I only ever buy French wine, so I know nothing about Californian/Chili/South African stuff.
I can, however, give one good tip for buying French wine. There are two ways to make sure the wine you buy will be at worst decent, and at best fantastic:
French wines can be two things: "Vin de Pays", or "Appletion Controllé". On the label, it will say either of those things. A "Vin de Pays" will usually be disgusting, while an "Apellation controllée" will usually be decent. That's teh first step.
Once you've found your "Appellation Controllée", check how it was bottled. If, on the label, it says anything else than "Mis en bouteille au Chateau" ("bottled in the castle"), it means that the winemakers have taken different grapes from different vineyards, some of them probably incompatible, and mixed them together. This is usually the sign that the wine won't be great.
But if it says both "Appellation Controllée" and "Mis en bouteille au Chateau", it means the grapes are pure, and the wine was made from a single vineyard. This is, in 80% of the cases, a sure sign that the wine will of good quality, that you won't get any kind of hangover the next day (unless you mix of course), and that enlightenment is approaching.
As for Champagne, the
Pink Laurent-Perrier is my favourite by a mile. I could drink that all day, everyday...