This feature (available only for iPods bought after March 2003) let's you easily add, edit and delete notes. Notes are text files that can be read on iPod screen, choose Extras->Notes from your iPod main menu.
* Lyrics, podcasts and RSS news will not be shown in the notes list
* Notes are splitted if bigger that 4K (that's an iPod limit). Link to following and previous pages are automatically added
If notes aren't shown correctly in your language you'll probably need to enable Unicode support in lyrics and notes under Preferences->Others.