Apple iPod touch iOS 3.0 - Manual (Page 131)

Chapter 19 iTunes Store 131
Verifying Purchases
You can use iTunes on your computer to verify that all the music, videos, applications,
and other items you bought from the iTunes Store or App Store are in your iTunes
library. You might want to do this if a download was interrupted.
Verify your purchases:
1 Make sure your computer is connected to the Internet.
2 In iTunes, choose Store > Check for Available Downloads.
3 Enter your iTunes Store account ID and password, then click Check.
Purchases not yet on your computer are downloaded.
The Purchased playlist displays your purchases. However, because you can add or
remove items in this list, it might not be accurate. To see all of your purchases, sign in
to your account, choose Store > View My Account, and click Purchase History.