iTunes 4.7.1 [Updated]
Now in Software Update...iTunes 4.7.1, for the newly introduced iPod shuffle:
iTunes 4.7.1 includes support for iPod shuffle and other performance improvements.
[Update] iTunes 4.7.1 is also available for download, with this description:
iTunes 4.7.1 includes support for iPod shuffle, support for copying photos to an iPod photo, the ability to show duplicate songs in your library, and other performance improvements.