HT1483: Updating iPodLearn about Updating iPod
Currently Being ModeratedOct 14, 2012 5:41 AM (in response to snoozinghamster)
Use File > Transfer Purchases from <Device>.
If there are any purchases on the device belonging to accounts for which your computer is not authorized then they won't be transferred. When you sync the device any media that is on the device but doesn't have a matching entry in the library will be removed.