I have been working on vala binding for gmpc, so I can use vala to code (new) parts of gmpc.
So today, using vala, I have added a improved song links list. This parses a small config file and shows links that apply.Think about looking up the artist page on wikipedia, or f.e. last.fm page.
The list can be updated via the internet (by downloading a page from the gmpc wiki).
example video: http://random.sarine.nl/gmpc-song-links.ogv
The second thing is the a gnome-do like interface, best way to understand is to watch the movie: http://random.sarine.nl/gmpc-easy-command2.ogv.