You will need:

• MPlayer-1.0rc2
• lastfmsubmitd (configured with your account)
• my patch
  

HOWTO:

#check if you have lastfmsubmitd helper program:
file /usr/lib/lastfmsubmitd/lastfmsubmit

#download and patch mplayer
wget http://www7.mplayerhq.hu/MPlayer/releases/MPlayer-1.0rc2.tar.bz2
wget http://banthar.googlepages.com/MPlayer-1.0rc2-lastfm.patch
tar -xvvf MPlayer-1.0rc2.tar.bz2
patch -p 0 < MPlayer-1.0rc2-lastfm.patch
cd MPlayer-1.0rc2

#complie it just like normall
./configure
make
#enjoy ! (and report bugs)

Known Problems:

• 30-char limit in MP3