Apple has launched a new “Purchased” section in the desktop version of the iTunes Store.
The section allows one to very easily see what music, TV shows, Apps and books one has bought with the Apple ID currently logged in. You can also re-download all the content easily with a “Download All” option under each category.
Apple added an easy way to see purchased items in iOS 5 but not laid out in a single easy to navigate menu like the one in the desktop version of iTunes.
Open up iTunes and check it out under the “Quick Links” menu on the right (you will most likely need to be logged in).