This combines the floral tartness of a sidecar with the sweetness of cherries.

2 parts Rye or Brandy
1 part Cointreau
Juice of one lemon
a few dashes orange bitters
a few dashes cherry bitters
a few dashes lemon bitters
a teaspoon of cherry syrup

Shake with ice, serve up in a cocktail glass garnished with a maraschino cherry and an orange slice.

1 ounce rye whiskey
1 ounce Cognac
1 ounce sweet vermouth
1 teaspoon Bénédictine D.O.M.
2 dashes Peychaud's Bitters
2 dashes Angostura Bitters

From http://gumbopages.com/food/beverages/vieux-carre.html

Custom version:
4 parts rye bourbon
2 parts cognac
1 part sweet vermouth
1 part dry vermouth
dash of aromatic bitters
1 maraschino cherry

Instructions

Pour bitters, liquors over ice in mixing glass. Stir and strain into martini glass, garnish with a maraschino cherry.

Dive deep: http://www.sfgate.com/cgi-bin/article.cgi?f=/c/a/2007/09/21/WI1ORSF9C.DTL

Variations:

A Dry Manhattan is made with dry vermouth instead of sweet vermouth and served with a twist.
A Brandy Manhattan is made with brandy rather than rye.
A Ruby Manhattan is made with port rather than vermouth.

DC's signature drink, the Rickey, is "an airconditioner in a glass" as Columbia Room's Derek Brown puts it, and fiendishly simple.

In a highball with ice, add in:
The juice of a key lime (and both shells, or the juice of 1/2 of a normal lime and a dash of simple syrup)
2-3 oz of rye or bourbon
fill the glass with sparkling mineral water (pellegrino works well)

Enjoy.

2 oz bourbon
8 sprigs of mint
1 tsp of sugar

Muddle mint and sugar in mixing glass. Add shaved ice and bourbon. Shake until frosted and pour all into rocks glass full of crushed or shaved ice. Garnish with a mint sprig.

See also:
http://usumcasane.tumblr.com/post/555114642 for crushed-mint-in-the-glass style
and
http://www.foodnetwork.com/recipes/sara-moulton/the-perfect-mint-julep-r... for extracting mint beforehand.