2. 10 Band Equalizer plug-in
Installation:
mkdir -p ~/.local/share/rhythmbox/plugins && wget http://www.lirmm.fr/~morandat/pub/upload/Main/rb-equalizer.tar.bz2 -O- | tar xvjf - -C ~/.local/share/rhythmbox/plugins
3. Last.fm Recommendations Plugin - Chooses the next song to queue based on the currently played track. Makes use of Last.fm recommendations.
Installation:
mkdir -p ~/.local/share/rhythmbox/plugins && wget http://airmindprojects.googlecode.com/files/lastfm_queue_0.3.tar.bz2 -O- | tar xvjf - -C ~/.local/share/rhythmbox/plugins
4. New Style Last.fm for Rhythmbox - This is a modified Rhythmbox version. It scrobbles via the lastfm client instead of submitting directly, just like scrobbling on OS X and Windows. And you can love the currently playing song.
Installation and how to use instructions.
5. Use Rhythmbox with Spotify - you need to compile Rhythmbox to enable this. Instructions, HERE.
6. Gnome Do + Rhythmbox - my favourite: an external tool which I am sure you've heard of: Gnome DO. Using it with Rhythmbox is AWASOME! How-to: Use Gnome-Do To Control Rhythmbox, Banshee, Exaile and XMMS2