You will see more and more people wearing these unique athletic shoes that standout by their curved soles. These shoes are designed to mimic walking barefoot (remember Earth shoes?) and thereby tone your legs while relieving stress on the knees and hips. They also align your spine in a way that improves your posture. If you'd like to try them out, here are the three main athletic anti-shoes that I've found people wearing:
MBT - Sport 2 (Grey) - Footwear
Reebok - EasyTone Go Outside (Champagne/White/Red Attack) - Footwear
Skechers - Shape Ups - Optimize (BlackN) - Footwear