But say you don't know what wine you will like, and you're not at a fancy joint where the word "sommelier" has ever been uttered. Or maybe you don't want to ask. Either way, you should check out iSommelier, a $0.99 wine-pairing app.
Just select what you'll be eating, and the app will recommend the varietal that goes best with your meal. Never heard of Malbec? iSommelier also gives you background on the kind of wine, as well as tips like what temperature to serve it.