just in case you don't already know, there's an audioscrobbler extension for the ipod that lets you post all the tracks you listened to on it remotely via last.fm. it's here: http://www.dave.cd/development/iSproggler-0.4.4.zip

if you use it, remember to update your ipod immediately BEFORE listening to music via any audioscrobbled app (itunes, winamp, etc.) or the ipod data upload won't work.