You can't always judge a wine by its label -- if you could, then you would buy nothing but Chat-en-Oeuf, because how did that cat get on top of that egg? For an app that can read far more into those labels than you, try WINEfindr
Just launched, this "pocket sommelier" uses patented "Visual Search" technology to give you a complete rundown on wines based on pictures you've snapped of their labels, frighteningly similar to the law enforcement technology that's even now linking your face to the selling of a goldfish to a minor in Manchester. Shame! Beyond flashing a rundown of region, vineyard info, user ratings, and average price, the app also delivers a full price comparison for all major UK supermarkets/booze outlets, and even allows you to e-purchase home delivery straight from the retailer; most awesomely, it'll also consider grape/style/acidity/price/'oak level', etc, in order to suggest an alternative plonk, though hopefully not Lovecats Chardonnay.
Other usefulness includes a meal-pairing component that actually drills down to cooking technique, sauce, etc, a "Discovery" function (specify wine/food type, country, or price, then shake the phone for a random vino), "Featured" bottles popular with other users, and a retailer-suggestion option sourced from your (anonymous) search history; recommendations get sharper the more you search, until the app's so brilliant it becomes self-aware, and murders Syrah Connor.
Because wine makes you forget, the app saves everything in a browsable history, which you can search by label in an iTunes-like "Bottle Flow" -- something you're no stranger to if you buy your Oeufs by the dozen.