Apple has released iPod Updater 2005-09-06 which includes new iPod Software 1.0 for iPod nano. iPod Updater 2005-09-06 contains the same software versions as iPod Updater 2005-06-26 for all other iPod models.
With iPod nano Software 1.0 you can:
• Listen to music and view album art
• Browse your photo collection or view photo slideshows with music
• Listen to audiobooks purchased from the iTunes Music Store or audible.com
• Listen to podcasts, downloadable radio-style shows delivered over the internet
• Store or back up files and other data, using iPod as an external disk
• Store and synchronize contact, calendar, and to-do list information from your computer
• Play games
• Store notes
• Add clocks for multiple time zones
• Use stopwatch as you work out to track your overall time and your lap time
• Lock your iPod Screen to prevent your iPod from being used by someone without your permission
More info and download link here.