Golf Digest: Natalie Gulbis swing

Golf Digest has an analysis of Natalie Gulbis's swing from her coach Butch Harmon. As you can see, she's from the photos from 2002 and the photos from 2006, her swing has tightened up considerably, especially at the top.

The most revealing part from the segment: According to Butch, "[Natalie] has an extra vertebra in her back, so her upper body turns very easily."