I know the technical differences. But you haven't explained why they matter to a folk music lover, who can easily access any of them? A forum for discussing folk music is just that, regardless of whether it is a web forum, a listserv, or a newsgroup.

BTW, there are so many errors in the Digital Tradition, I wouldn't consider it to be quite as valuable a resource as some make it out to be, particularly when there are so many much better quality sites with lyrics. Would anyone like me to list some of those too?