The easiest and quickest way to chop garlic is by crushing it. Take the flat side of a largeish kitchen knife and lay it over your garlic, one clove at a time. Using your hand, quickly and firmly crush the garlic until it starts to split. You want to do this in one fluid motion if possible, really press your weight against it.
Now that it's split, chop the garlic perpendicular to the splits and you will end up with finely chopped garlic in seconds.