The photo savvy posted is not a great example of automatic release because the rider has dropped her hand too low, breaking the straight line from bit to elbow. The photo RachelAlexandra posted is better but not perfect - line is broken upward slightly and there's a little extra upward break in the wrist.
The Anne Kursinski article is wonderful, and I love her suggestiong to ride with a "driving rein" to help get the feel. It's the way we used to introduce contact to intermediate riders.
But IMO, you should master a correct crest release before moving gradually to the automatic. George Morris and others dislike the crest release because it's become mannered and used when no longer appropriate - doesn't mean that it's not still useful and appropriate at certain levels.