It should all happen fairly simple, according to GetJar. Users would have to search for something on Yahoo's mobile site and the yielded results would include the category apps. As we tested it on an Android handset, searching for sports would return apps like “NBC Sports”, “Sky Sports” and “Sports Illustrated” on Yahoo Mobile. Installation went seamless, just as expected. The service should be available to Android, BlackBerry and Windows Mobile phones. Let us know if you had any issues.
source: GetJar Developer Blog via IntoMobile