Another important aspect of dry-fire technique has not been discussed, and that is sight alignment. The best trigger control in the world will not allow you to hit anything if you have not also trained your eye to focus on the front sight.
Dry fire will work wonders for your trigger finger, but it can also train your eye. There is a distinct difference between looking at your front sight and really seeing it. Train your eye to focus on your front sight during dry fire. This will help when you go to shoot real targets because your eye will naturally fall to the front sight, allowing you to concentrate and shoot good groups. Many people actually shift their focus from sight to target, which screws up their groups.
Also, when dry-firing and focusing on your front sight, you can diagnose problems in your technique. For example, when you press the trigger, does your front sight move off target? If so, you have just identified a problem and can correct it, be it a grip issue, breathing, or trigger control. If you don't focus on your front sight, you will not notice a problem until you are at the range and, more importantly, until long AFTER you have reinforced bad technique repeatedly during your practice sessions. Perfect practice leads to perfect performance, sloppy practice leads to sloppy performance.
Use dry fire to train your eye as well as your finger and you will be well ahead of the game.