Beverage choice should be simple: coffee or tea to rev up, wine or beer to spin down (App Store links). Of course, when it comes to drink choices, there's definitely an app for that: from the makers of espresso-instructions app Barista, we now have the $0.99 Cellar (under App Store review and appearing momentarily). Cellar's slick UI and quick data entry make keeping track of your wine library almost as fun as actually drinking the wine you collect.
When you start up Cellar, you face an empty winerack; you can add bottles one by one, entering both vintage details and customizing the look/label of the bottles with photos of the bottle labels. You can adjust the number of bottles of each kind of vino you have stored away, and then as you polish them off the 'empties' are stored in the Garage area of the app for reference or repurchase.
Cellars isn't an industrial-strength wine database or collection manager (My Wine or Velvet Vine Wine Pro might be better choices there, or a general-purpose database like Bento), but it is a handy way to remember what you've bought and liked. I'd like to see future versions support importing label images from the photo library (for iPod touch users) or download them from online wine libraries. Update: Apparently the library-select feature is already in place for iPod touch users. Readers also suggest checking out Drync for higher-end wine cellar management.
Cellar's $0.99 introductory price won't last for long. Check out the gallery for more Cellar shots.