I think New Balance designed these to compete with the Vibram 5 fingers in the barefoot running craze.  I have run in the them a couple of times now and they are extremely light and comfortable.  I have to imagine they are more comfortable than having each toe in a separate "compartment" like Vibram 5 fingers.

The front is a bit wider so that your toes have room to spread during the running stride so you don't develop blisters.  The only negative in my book is that they are made in China.