I've already found lists of the main museums on some tourist sites, but I really love random little museums devoted to things like, oh, I don't know, fonts, or tea, or wood carving, or cucumbers (to make up some random examples)! The kinds of places that are too small and poor and of limited interest to have much of a web presence.
So, any suggestions? Even if it's just "There's a sign on the corner of X Street that points at the Museum Of Lightbulbs. I've never been, but I remembered it because it's such a strange thing to have a museum for," it would be great to hear about it!