I'm not 100% sure if they still offer it (last purchased in Jan 2012), but they used to have a "Wine Walk" that was $20 for two 2-ounce pours from each of three countries: Italy, Germany, and France. You could purchase this option from any of the three and select from a menu of options at each country (usually both whites and reds). This provided a nice opportunity to try different samples in each of the three countries.
For beer samplings, you can always go to the "Rose & Crown Pub," though it offers the standard options from a British/UK pub: Guinness, Harp, Strongbow, etc. Each country has its own options for beer/wine/liquor, usually right along the World Showcase promenade. When in doubt, keep walking until the next country and you're sure to find a large selection of alcoholic choices.