Shopping Cart overview With iTunes 8.2.1 or earlier, you can choose to have iTunes add the items you want to buy to a shopping cart instead of purchasing them in 1-click.  The shopping cart adds an extra layer of protection against accidental purchases. Note: With iTunes 9.0 or later, only 1-click purchasing is available. If you were using Shopping Cart in earlier versions of iTunes, the contents of your Shopping Cart can now be found in your Wish List.

See more here:
iTunes Store: Using the shopping cart

Similar Posts:

• iTunes Store: How to use Wish List
• iTunes Store: Where can I download and sync my purchases?
• iTunes Store: Where can I download and sync my purchases?
• The Key to Keychain: Effective use of Apple Keychain
• Finding the files of your iTunes Store purchases