You can let the app know what you have on hand, and it will suggest what you can make with your ingredients. You can also get a random suggestion, or just explore the database for something that interests you. You tell the app how many people you are mixing the drink for, and it will adjust the ingredients list. It also contains a nice list of non-alcoholic drinks that should please those so inclined.
The videos are very well produced, and obviously not the work of amateurs. I did notice that sometimes the videos were a bit slow to load, and a couple of times they stopped in mid-play, but eventually they picked up. The videos are not required to make the drinks, but they are a nice instructional touch.
Although not the only iPhone app that helps you make cocktails, it is well organized and visually attractive. My only gripe was the 'send to friend' function. I thought it would allow you to email a recipe for a drink to someone, but instead sends a pre-formatted email suggesting they go to the App Store and buy this program. Boo. You can also get ten more cocktail recipes by filling out a brief form and providing your email address, and answering some marketing questions about other services the developer might provide. Double boo.
Otherwise, this is a solid app that does what it advertises, and does it with visual style. A handy thing to have in your pocket when you want to drink something different, or see what you could create with what you have on hand. I'll drink a toast to this clever app.
If you want to spend your money on drinks rather than iPhone apps, here is a link to Cocktails, and Cocktails + which are free. (Note: Although the icon on Cocktails+ notes that it is free, it is still apparently $2.99US. It was free for a limited time last week, and Apple apparently did not update the icon.)
Screen shots below: