Here’s a set of the 96 most “interesting” pics on flickr tagged “Grand Canyon”. Flickr has over 2 billion photos, many of them very interesting.
Best way to see them is to click on View as Slideshow after the link.
Grand Canyon – All GC Sets Combined by Interestingness
Here’s one of my favourites:
original – Al_HikesAZ
besthike.com 
I’m flattered, but I need to set the record straight. Many of these are among “the” “Most Interesting” photos of Grand Canyon hikes when you search Flickr for “Grand Canyon” Hiking or “Grand Canyon” Backpacking. But these are actually “My” “Most Interesting” photos that I have taken in the last 2 years since I started carrying a digital camera on my hikes. I have recently added a few dozen photos of a Nankoweap Trail trip so you will find a lot more than 96 photos now. You won’t find any photos of Havasupai or the Skywalk but I won’t make any disparaging remarks about those hikes here.
Oops. Thanks for clarifying that.
I hope to get down into the Grand Canyon in 2008. And possibly Copper Canyon in Mexico.