Do MP3's encoded by iTunes contain my email address, and how can I remove it?
I've seen reference to various iTunes Data Anonymizer applications. This should be a reasonably comprehensive list of where you should and shouldn't be worried.


DRM Encumbered Files (protected AAC media) do not carry direct personal information such as your name. They do of course have personal information to the extent necessary to examine and validate your license, but this is information that should only be able to be understood by Apple.
So called "iTunes Plus" unprotected MP3 files do contain your personal information. A cursory search led me to Privatunes. Note that I am not vouching for this software. Your mileage may vary. Make a backup of any files you have before running them through this, or any other modification software.
Files encoded via the CD Ripper does not tag data into the encoded files, no matter what format or quality you choose. Nor will arbitrary media files you choose to import into iTunes.


Did I miss a means in which data may become "available" into iTunes?