I just found out about this project and then found the Mudcat thread here. I go to a singer's group where we sing mainly traditional music, completely unaccompanied, both solo and songs with choruses.

Sometimes new people join us who have heard a bit of this music and are interested, but don't know where to find songs. I think Jon Boden's project is a great resource, and I just sent out the link to several people. Not only renditions of the songs, but background information and additional links as well. I'm happy to listen to these songs myself, and I think this is a great introduction for people just starting to listen to and sing traditional music.