Open Door Networks and Project A have announced a series of six iPhone apps will be released in parallel with the new Ken Burns PBS series, "The National Parks: America's Best Idea." The companies plan to release a single app to their Envi product line each day an episode airs, between September 27th through October 2nd, putting out a total of six programs. Based on the companies' iEnvision web-image browser iPhone app, the new apps utilize the "Ken Burns" motion effect to showcase thousands of web-based photographs from about 400 National Park Service sites.

The television episodes are chronologically based, starting with the Northwest's Yellowstone, the first National Park and California's Yosemite park. The series of iPhone apps also begin at these locations with Parks Envi NW and Parks Envi CA. Each program costs $1, providing access to detailed park information and displaying images of the national parks, monuments and other sites of a particular area of the country.