The MiniStore was switched on by default, without any notice that this service was collecting your information, nor which information was being collected, nor what Apple did with this information.

The new version of the iTunes 6.0.2 installer pops up this screen before turning on the MiniStore:

The iTunes MiniStore allows you to discover new music and videos right from your iTunes Library. As you select items in your Library, information about that item is sent to Apple and the MiniStore will send you related songs or videos. Apple does not keep any information related to the contents of your music Library.

Would you like to turn on the MiniStore now?

That’s pretty good news, but I’d still like to know why Apple is transmitting my Apple ID number with the data collected.