A while back, Kat posted a link to FolkLib, which calls itself"The FolkLib Index is an on-going attempt to index information on the World Wide Web that is related to the fields of Folk Music, Bluegrass and Old-Time Music, Acoustic Blues and Fingerstyle Acoustic Guitar. Among other topics, special pages are also devoted to Harp (the stringed kind) Players and Wisconsin Musicians."
Take a look - it's quite an effort.
-Joe Offer- (I added it to our "links" page)