Along with the Security Update, Apple has also released iPod Updater 2005-09-23. The update provides improvements to iPod shuffle, iPod nano, iPod mini, iPod photo (or iPod white), and iPod with click-wheel.

Here is the full description of the update:

iPod software update 2005-09-23 delivers iPod Software 1.1.2 for iPod shuffle, iPod Software 1.0 for iPod nano, iPod Software 1.2 for iPod with color display, iPod Software 1.4 for iPod mini, and iPod Software 3.1 for iPod with Click Wheel.
Features of iPod Software 1.1.2 for iPod shuffle

Bug fixes for iPod shuffle