What is a good Manhattan recipe?

A Manhattan is a cocktail that can be made with either bourbon or rye.  I prefer using rye due to the extra spicy and peppery flavors of the rye enhancing the drink.  For the drink, mix two ounces of rye with one ounce of sweet vermouth in a cocktail shaker.  Add 2 dashes of bitters to the mix.  Add ice, cap the shaker, and shake vigorously for about 15-20 seconds.  Uncap the shaker and pour the Manhattan into a glass.  Garnish with a Maraschino cherry if you desire.