The best and most extensive Nihontô resource site on the web with a great deal of useful, coherent information and a huge number of links for both newcomers and more experienced aficionados of Japanese swords. .
An excellent site providing lots of information for those interested in Japanese sword fittings. THE site for tsuba
Japanese Sword Society of the United States (JSSUS)
Interesting articles from the JSSUS journal, sample sword descriptions and instructions for joining the society