I've just come across the Dutch shanty choir De Batraven where you can listen to lots of shanties. I arrived there through Chants de marins where you can listen to the very same songs. They say the recordings come directly from the singers' sites so maybe some links don't work. On the links section of this blog you can find links to some groups' sites (chants de marins, chants de mer, groupes), to repertoires (chants de mer, répertoires)...