“iTunes preview pages rank well in Google search results because they are very search engine friendly for app names. The URL, page title, meta description, meta keywords, and the H1 tag are all loaded with the app name. These pages also have lots of incoming links from every blog entry, review, and so on that uses the iTunes link. I suspect that the Playboy app comes in at #7 because of all the recent news and opinion articles that link to the app as an example of a big publisher that escaped the iTunes sexy app purge.
It is interesting to note that the iTunes preview page uses the “nofollow” attribute for links to the app’s homepage, so the PageRank of the preview page does not convey any benefit to the developer’s site .”
Developers, take note.