It seems like gradually, all of the iTunes content is slowly shifting to the web -- now you can preview iPhone apps right in your browser, thanks to iTunes Preview.

It was less than three months ago (November, 2009 to be exact) that Apple debuted the new iTunes Preview feature, which made it more convenient to see what music was available from iTunes using your web browser -- even if iTunes itself wasn’t installed on your system. This morning, that system gets even more useful thanks to the expansion of iPhone and iPod touch applications into iTunes Preview, according to TechCrunch.

That should bring an end to the often-annoying page that Apple threw up notifying you that the web browser was being redirected to iTunes, replacing it with a web page that essentially duplicates the iTunes look, complete with screenshots, app description, release notes, ratings, reviews and more.

Of course, if you want to actually purchase the app in question, you’ll still have to click the “View in iTunes” button -- but we wonder given Apple’s (and everyone else’s) ongoing shift to the browser, if iTunes itself may be morphed into some kind of standalone sync app, since it gets less and less useful with each one of these kinds of updates.

And for those who didn’t notice, the iTunes Preview music pages are also much more user-friendly, having gained web-based audio previews. With Apple’s acquisition of Lala recently, we wonder just how far Cupertino plans to go with this…