Eye Tracking study...

Here are 2 really nice articles on Eye Tracking studies...

• The Best of Eyetrack III: What We Saw When We Looked Through Their Eye
• Scientific Web Design: 23 Actionable Lessons from Eye-Tracking Studies
  

One random idea in the field I work in. Apply them for designing in-shop layouts and stacking! While category management gives a broad direction, I would be really interested in the insights such a study might throw up.