The "Download Now" link directs you to the iTunes App Store, where you must continue the download process. You must have iTunes installed in order to open the link, and you must have an active iTunes account to download the application. This download may not be available in some countries.
From Italic Labs LC:
Pop Art! displays a slideshow of HUNDREDS of the most stunning images of pop art from around the world -- youve NEVER seen a collection like this! Some of the renowned photographers include Mary Ann Wakeley and Tony Worrall. All of the photos can be used as WALLPAPER by simply tapping the screen and pressing the Save button. This will save the image in your Photos app! FEATURES: *Hundreds of stunning images to keep you entertained for hours *Use any image as Wallpaper for your iPhone! *Simple swipe to advance / revisit images *Professionally produced background ambiance *Professional photographers LANGUAGES: English REQUIREMENTS: Compatible with iPhone, iPod Touch, and iPad Requires iPhone 3.0 Software Update 2010 Italic Labs LC, All Rights Reserved http://www.italiclabs.com firstname.lastname@example.org