What I don't understand is why, with all the technology today, most keepers are unaware of the tell tale signs that give away where the ball will be going and decide to guess. The one that helped me the most was the position of the non-striking foot allied to the direction in which the toes of that foot are pointing when that foot is planted immediately prior to the strike.

Is it in front, behind or level with the ball?
Is it right next to or wide of the ball?
Where are the toes of the non-striking foot pointing?

The answers to those questions, allied to body shape and you will get it right 9 times out of 10. You won't save them all but you will save a lot compared to other keepers.