From USA Today (with a great picture):
Technology that doctors expect will help detect precancerous cells faster and less painfully also could someday take cameras to parts of the body where no camera has gone before.
Cameras the size of pills could “put eyes on tools” for laparoscopic surgery, snake inside a bile duct or fallopian tube, or weave their way deeper inside a person’s lungs than any non-surgical device has been able to go.
Unlike a standard endoscope, which is almost a centimeter wide and can only be inserted into the esophagus after a patient is sedated, a new device invented at the University of Washington consists of seven fiber optic cables encased in a capsule about the size of a typical pain killer.