iTunes Search API Around the Corner?
Could the Apple iTunes Store soon have a fully public API? On Apple's iTunes page, they have a search widget featured in the sidebar. What's interesting is that this AJAX-powered widget is returning a JSON object. How very API friendly!
The script located at http://www.apple.com/itunes/scripts/itmsSearch.php currently accepts two parameters, searchTerm and searchType where the type is one of album, allTrack, musicVideo, movie, tvSeason, audiobookLockup or podcast. Here's a quick example that searches all podcasts for 'web standards':
A quick attempt to hacking the URL didn't seem to reveal any callback function feature, which means client-side cross-domain calls are still out of the question. In the meantime, however, a service proxy could be easily implemented to pass the information from the API to your application.