I somehow feel compelled to reply to any post with "beer" in the title...
Sadly, the free beer samples are long gone. It was always the perfect break for us, especially on a hot day. They do still sell beer throughout the park, including the snack kiosks, and Dine with Shamu features all-you-can drink beer and wine, but it is not the same as trying some of the interesting beers they would offer with the usual Anheuser-Busch fare.