Been feeling a bit crappy today, then stumbled upon this flickr site by Kate Harding. It posts 100+ photos of people, listing their height, weight and BMI. It lets you know if they are "normal," "overweight," "obese," or "morbidly obese."
BMI is bullshit.
But just like "8 glasses of water a day," BMI is easy to grasp, so it's idea spreads like wildfire...then it is hard to contain. It can be used to generalize, but says little about your actual health.