This is an oldie but a goodie from coffeegeek.com .
There's a lot of potential variation to this recipe, but we've outlined the original steps below. Feel free to experiment.
For a good read, and an explanation behind the whole recipe (with a stack of interesting comments), see the original post on Coffee Geek.
This recipe produces more of a concentrate that is pressed over ice, and then finished off with milk (if you desire).