Fotopedia has just announced that it will shut down on August 10. The web service and all of the beautiful Fotopedia iPad apps will stop working on August 10th. If you have any pictures stored on Fotopedia, download them before August 10th.
Storehouse is a nice possible replacement to the Fotopedia reporter app.
To find other imagery of national parks and natural wonders, visit Google Street View Special Collections and the World Wonders Project.