The current NP logo.
Nintendo Power Magazine is a magazine read by peppy villagers in Animal Crossing. The Nintendo Power Magazine has a maze in it, and peppy villagers will ask the player to help finish the maze in the Nintendo Power Magazine.
Nintendo's fan magazine in real life is also called Nintendo Power. Several issues released around the time the GameCube version was released also had a section called the Town Guardian that acted as a newspaper.
Nintendo Power also was the first to release the codes for the Mario Set.