Have you ever had an espresso martini? I probably sound silly, but I didn't know about this cocktail til recently, and now it is definitely a favorite. Here's a recipe that will not fail you:
1 oz cold espresso
1.5 oz vodka (Absolut preferred)
1.5 oz Kahlua
1 oz white creme de cacao
Pour all ingredients into shaker filled with ice. Shake vigorously, and then strain into chilled martini glass. Add a dollop of vanilla ice cream. YUM!