As you might have heard, Apple has announced iTunes in the Cloud, allowing users to download past iTunes Store music and music video purchases directly to their iPhones, iPads, or iPod touches, free of charge. If your device is running iOS 4.3.3, simply open the iTunes Store app and look at the bottom row of tabs. You should see a new tab called Purchased, from which you can access and download all your past iTunes Store music purchases. You can look…