Last I checked, a web page had to be on the web in order for Google to crawl the page and serve it up in search results.  But then how does it crawl iTunes?

On a recent search for “implus iphone application” I came across the iTunes store page ranked at #8 in Google.

Yes, the iTunes Store may be built on WebKit, or some sort of web application on the back end, but how exactly does Google get there?  Does the Googlebot run iTunes?  Ohh there is a possibility.