Rate Beer for Android is an essential app for an serious beer drinker. It allows you to easily (through simply scanning a bar code) find reviews on a massive amount of beers, plus add your own reviews. It isn't only bottled or canned beers that can be rated. No, Rate Beer for Android also features user reviews on a huge amount of beers from micro-breweries or local pubs.
Check out your local region - you may be surprised at how many beers actually manage to feature and be reviewed in this app. With the ability to find your closest beer at all times (through Google maps integration), this is a great app for those who want to try a wide variety of beers and drinking establishments.
In the words of the developer:
Mobile interface to the world's largest source for information on craft beer: RateBeer