This tool queries http://itunes.apple.com/linkmaker/, retrieves all available results and outputs a csv file, as well as a gexf file containing the relations between items in the itunes stores and their categories .

The iTunes store scraper intends to make available to the digital methods researcher the data associated to items in the iTunes store. Per country and media type, e.g. music or e-books, the researcher can enter a key word as one would do in iTunes, Apple’s native interface for the iTunes store, and the scraper will retrieve all items on offer. With the use of the open source network visualization software Gephi, the .gexf file can be used to detect clusters of densely populated as well as related categories.

More (technical) info about the fields returned can be found on http://www.apple.com/itunes/affiliates/resources/documentation/itunes-store-web-service-search-api.html.

This tool does not work in the Chrome browser