Most commercial brewers use what is called, "cut and stack" labels. Its usually a coated paper, thinner than your normal 80lb bond printer paper. Then, they apply the labels with a gluer, which is typically a hot melt glue. I'm also seeing that more of the breweries are going toward a self adhesive label. Its a little more expensive, but a lot easier to apply.
If this is for home use, paper and glue is fine. If you are looking for larger quantities for a commercial brewery, I could hook you up with a great label printer in Cleveland for self adhesive labels.