Apple began offering HD content on the iTunes Store in 1080p a little over a year ago, and has been gradually increasing the amount of content available in the higher resolution. The good news is that Apple considers the 720p and 1080p versions of HD content to be the same purchase, so if you have older 720p content sitting around in your iTunes library, you can very easily upgrade it to the 1080p simply by downloading it from your iTunes Purchase…
