Yesterday, Apple announced that the iTunes Store was now selling $20 high-definition movies for viewing on a computer, as well as renting computer-ready versions for $4-$5 in the same way that it has been through the Apple TV. In an impressive, though space-consuming feat, Apple provides users with both a high-definition video for computer and Apple TV use, as well as one that’s lower-resolution and capable of being played on your iPod or iPhone.…