I tried to do this once before but it just turned out awful. I want to kick the Starbucks habit and this will go a long way to helping me achieve that. Thanks!
If you're looking to kick the Starbucks habit by replicating their effects at home, here's the magic secret (don't tell I told, or they might come after me to get back that apron I forgot to return):
Use a bold roast (for most Starbucks-like taste, use Starbucks' Gazebo Blend, sometimes marketed as Ice coffee blend. Or just use the bold roast of your choosing).
Brew your coffee with twice the grounds (or half the water) that you would normally use.
When coffee is brewed, pour the hot coffee into a container full of ice which is the same volume as the amount of coffee you brewed.
When you are ready to drink your coffee, add some more ice (about 1 fl oz for ever 2 fl oz of iced coffee). If you like it sweetened, add 1 tsp of simple syrup for every 4 fl oz of this final mixture (including the ice you added).