My friends Dan Baumbach and Brett Edge have created a really cool application for the iPhone and iPod Touch devices. It is called iFotoGuide, and their first national park to be released is Arches National Park.
iFotoGuide provides traveling photographers with all the resources to organize a photography trip to Arches and make stunning images while on location. iFotoGuide has some really cool features, but my favorite feature are sample photos of locations in the park, how to get there and what types of accessories to bring. You can also find places to photograph by time of the day, such as sunrise, sunset or middle of the day.
I wish this application was available for my first trip to Arches N.P. 10 years ago. The price is $4.99, which is much less than a guide book, and this application will be updated over time. Updates get synced back to your computer. Highly recommended.