I have taken beer many a time in checked luggage as well and have had good luck with it. My method is (probably over-doing it) as follows:
Step 1: Wrap each bottle with some newspaper.
Step 2: Put each bottle in a plastic bag. I prefer the ziplock freezer bags.
Step 3: Wrap each bottle in a t-shirt.
Step 4: Spread them out throughout the case making sure they're not near the edges or too close to one another.
Travel, land, refrigerate, and enjoy.
