A friend of mine just told me about this blog Evacuated Shellac which is really something. It has MP3s of 78s from around the world and some good descriptions of things too. If you like old rare old world music this is a good place to hear some for free. What's not to like (save the paucity of Mexican stuff?) It is kind of self-consciously eclectic, but the music is great so you can cut the dude some slack (I am figuring it is a dude, how many female 78 collectors are there really?)
This is one song I thought was just great.