The link Malcolm provided has a convenient blue clicky to the above-mentioned Shrine to Music museum. I think some of my favorite instruments there are the little dancing masters' fiddles (you can see them in the Pressler Gallery if you go to the virtual gallery tour). They're like a fiddle equivalent of a backpacker's guitar. RE: the nyckelharpa, have a listen to Olov Johansson, he plays beautifully.

Margaret