There is a tutorial explaining the use of this plug-in (old Fabrik version, but showing the principles; thx @startpoint for saving)
And here is a quick Jing video of a Last FM Scrobbler setup, to import a Scrobble listening list into a Fabrik list.
http://screencast.com/t/D9Tuxn4Bb
(Attention: the "Data map" fields seems to need {} meanwhile)