If you've ever been irked by the need to download iTunes Store purchases right away, or by seeing them constantly pop up in your Downloads queue until you download them, you'll be happy to know that Apple has changed this. You can now choose to download iTunes Store purchases later, as long as you're in a country which has iTunes in the Cloud. If you choose to download the content - a movie, TV show, or other large download - at a later date, it will simply be added to your Purchased list and you'll be able to download it later. Or not. Because in some cases, you may want to buy something on, say, an iPhone, but watch it on an Apple TV, and never actually download it locally. This will save a lot of time and bandwidth.
Mac OS X Hints