The first sip is just right, but by the time you get to the bottom of a long, cool glass of iced coffee, you're drinking a watery shadow of your former beverage. If the ice is made from coffee, it won't dilute your drink as it melts. Freeze hot coffee (or tea, if you prefer) in an ice-cube tray, then use the cubes to cool your brew.
Coffee Ice Cubes
Martha Stewart Living, June 1995