I'm just finishing up a road trip to Utah and Arizona. I've finally had a chance to put my new 10-22mm Canon lens to the test, and I've been nothing but ecstatic about the results. At 14f on a tripod the images are razor sharp through most of the zoom range, though the edges aren't quite perfectly sharp between 10-12mm.
We visited Zion National Park, Bryce Canyon National Park, and the Antelope Slot Canyons. I was able to get some pretty good shots from Zion, and some simply amazing ones from Antelope.