After having switched my default music player to xmms2, I needed to enable the scrobbling of my tracks to last.fm. Because you have to install some packages and because there isn't a gui to configure the audioscrobbler client, I thought I would post this. You probably wouldn't be here if you didn't know xmms2 (!=xmms), but if you don't, you can read more about it here.

Installing the packages

The name of the audioscrobbler client is xmms2-scrobbler. You can get it from the repositories. Except for one, all dependencies will be taken care of by apt. The additional package we need is called libevent-loop-ruby. So we do:

sudo apt-get install xmms2-scrobbler libevent-loop-ruby

Configuring the client

The client tries to read the configuration in ~/.xmms2/ instead of ~/.config/xmms2/ where the files are located. So we make a symlink:
ln -s ~/.config/xmms2 ~/.xmms2

Next we have to create a directory where the configuration files of the scrobbler client will reside.
mkdir -p ~/.config/xmms2/clients/xmms2-scrobbler

In this new directory we have to create a file for your last.fm credentials.
nano ~/.config/xmms2/clients/xmms2-scrobbler/config

In this file we enter only the following 2 lines:

user: YOUR_YOURNAME_HERE
password: YOUR_PASSWORD_HERE


Save en exit (CTRL-x, y, ENTER)

After this we have to symlink the actual xmms2-scrobbler script to the startup directory of xmms2, so that it will start at the launch of xmms2.
ln -s /usr/bin/xmms2-scrobbler ~/.config/xmms2/startup.d/

Now restart xmms2 if it was running, or just start it if it wasn't and check your last.fm profile:
xmms2 quit
xmms2-laucher

Problems

Sometimes xmms2 doesn't start and gives errors instead. This is probably because the daemon is still running. To kill the daemon do
ps aux | grep xmms2d
Then kill the xmms2d daemon
sudo kill PID_OF_XMMS2D_HERE

More

The xmms2 audioscrobbler plugin is written by Tilman Sauerbeck. Visit his non-blog for more information and the latest release.
I switched to xmms2 after having used xmms, audacious, amarok, exaile, cmus, moc and some others. My problem has always been that I had to choose between a lightweight player without library or a heavy, slow starting one with a library. With xmms2 I don't have to choose anymore. The players I use also have to be easy to control. My solution for this was to use the xmms2 plugin for gkrellm (package is called gkrellxmms2). So with this setup I have a leightweight, fast starting musicplayer with a large library (+50K tracks) that's easy to use and feature filled. Sure, xmms2 isn't a 'just press play' kinda music player, but once I figured out how to operate it, it was bliss.