All weekend long M's sister kept telling us about this app she uses when critiquing beer. Both her and her husband are both brewers and judges, which is pretty awesome. Anyways, this app gives you the low down on all the different beer styles, and how it should look, taste, and smell. Definitely will be helpful when we start brewing (which I need to do soon or my interest will fade) again.
They have it for both iphone and droid. Happy drinking!