Google just Street-Viewed (is that a word?) the Grand Canyon, and you can take their tour through Google Maps.
On their blog, they also shared video about how they did this, with a team of hikers carrying down forty-pound, backpack-mounted cameras. (More photos of the hikers here) They went down Bright Angel Trail and South Kaibab Trail, out to Plateau Point, and eventually all the way to Phantom Ranch.
They have been to the North Rim but only on the roads, no hiking down from there. Maybe that's for next summer.