There was a question above about tapping the balls. The way that is done in Europe seems to be very, very different from what most in the US think of when they talk about tapping the balls. In Europe, it goes something like this, from what I've heard for nine ball:
You get a template with holes in it for the places for each ball, like the usual racking templates. The holes are slightly closer than one ball diameter apart. The template is put in the required position (and taped down?). One hole at a time the cloth is dampened through the hole, a ball is placed on the hole and it is tapped firmly in place. The ball is then removed and the next hole is tapped.
The result of this "training" is nine (or 8) small craters for the balls to settle into all by themselves without any rack or template on the table when racking. Because the spacing is slightly smaller than a ball diameter the balls are tight.
Here is an example of how that works at straight pool where a template on the table wouldn't work so well:
https://www.youtube.com/watch?v=OmZh_0HrdWI