Good Irish cocktails include the Emerald and the Copywriter, which both prominently feature whiskey. Another good Irish cocktail with whiskey is EVR's Whiskey Sour, which also includes Pimm's.
The Emerald is almost the same as a Manhattan, but the drink calls for Irish whiskey. It also calls for orange bitters instead of Angostura. The Copywriter is a blend of whiskey and lemonade with honey to make it even smoother. Some bartenders add a bit of seltzer or soda water to give it fizz. For EVR's whiskey sour, bartenders mix two kinds of whiskey, preferably Irish and Scotch, with Pimm's. Also in the drink are fresh lime and agave nectar.