Here's Liz demoing the Heel Brake Stop.
Clip 1: Note the hip drop at the end that causes the final stop
Clip 2: Note the straight braking leg and wide triangle formed at the knee.
Clip 3: Note that skates remain parallel to the direction of travel and start from a very narrow stance.
Requires Quicktime 4.
More details in the Give Yourself a Brake! Orbit article.