gtkpodscrobbler is a set of scripts which bring iPodScrobbler and gtkpod together: when you plug your iPod into your computer and sync data using gtkpod, your latest listenings get sent to last.fm.
More info here: README
The latest release is available here: gtkpodscrobbler-latest.tar.bz2
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I installed it according to the README, but it doesn’t seem to work. :( Nothing was scrobbled to Last.FM when I synced my iPod with gtkpod.