Can be found here: http://www.last.fm/group/Audioscrobbler+Beta
Judging by when the group was created, this was first proposed around 2006. As they say themselves, since it is a Beta version expect issues, some of which have already been posted here: http://www.last.fm/group/Audioscrobbler+Beta/forum/30705/_/2096597
I had to get it myself as, after reinstalling due to dodgy scrobbles, I couldn't use the old version at all (Last.fm support were seemingly flummoxed too). Looks nice and flash but I'm only bothered about it working. I think the main issue with Last.fm usually seems to be that everyone eventually has scrobbling problems, so many give up after a year or so.