1) What is predictive autofocus? How is it different from continuous autofocus, and what would it ideally be used for?

2) Many cams feature multiple AF points. I've tried 30d's 11pt AF, as well as my fz30's 9pt AF, but apparently they rarely focus on the subject i want, end up still use 1pt AF. Is there a special technique to apply?

3) Is there a significant difference in AF system of dslrs vs compacts?