The Boomerang is a popular weapon used in The Legend of Zelda series. In the earlier games that it appeared in, it would stun the enemy when it touched it. It would let Link go up for close combat without having to worry about being attack by most enemies. In the 3-D Zelda games, you are able to aim it, and also attack multiple enemies or targets all at once. It allows Link to solve previously unsolvable puzzles. The boomerang also can hit far away objects and enemies. It is considered a melee weapon in Super Smash Bros Brawl.
Super Smash Bros. series
In Brawl, Toon Link's side special was this though significantly different than Melee's. It was much large and slower. This move carries over to Super Smash Bros. for Nintendo 3DS/Wii U.