While I don't have a list of museums, other than the Smithsonian in DC, I do have a lot of links to other ethnographic weapons sites on my website. The
specific page is:
http://japaneseswordindex.com/world.htm
Hope you find some of the links useful. A few may be out of date as I haven't done a full link check for my entire site in a long time. No doubt most of you know about many of them already.
Rich S