Recording mode discovered by hackers (see link
below). Currently available only in test mode, and only capable of
recording a few seconds of audio, the feature is sure to be made
available as a normal function in future firmware releases from Apple. A
line-input cable (coupling through the docking connector) is rumored
to become available. Currently recordings can only be made through the
headphone jack.
Apple's feature list:
Customize main menu
Create On-The-Go playlists
Rate songs
Shuffle songs or albums
Repeat one or all
Sound Check on or off
20 Equalizer settings
Backlight timer
Display contrast
Alarms on, off or silent
Sleep timer
Date and time
Display time in menu bar
Contacts sort and display by first or last names
Clicker on or off
Languages: English, French, German, Japanese, Spanish, Italian, Dutch, Danish, Norwegian, Portuguese, Finnish, Swedish, Korean, Simplified Chinese, Traditional Chinese
Included Accessories: Earbuds, AC adapter, 4-to-6 pin Firewire adapter, dock connector to Firewire cable. 15GB and 30GB models: Docking stand.