Monkey Island shows up everywhere. One pretty direct reference I discovered over christmas was on some pirate-themed board game I played with my eight year-old cousins. I can't remember the name of the game, but the 'board' was like a roll-out piece of cloth, like a treasure map. You had a ship and the map had a grid so you could move around etc. They seemed to like it.
Anyway there were all these random islands for scenery, including one Monkey Island.