Actually, the book I meant to list is called "Gendai Toko/Kinko/Shukugata Soran" also by Ono. They all give loads of info on modern smiths and craftsman (togi, shirogane-shi, saya-shi, hori-shi, etc.) that I have found useful. "Nihonto Shokunin Shokudan" has lots of great pictures and in depth info on several craftsman like Ozawa Masatoshi (Okimasa student) and Nagayama Kokan. It is similar, but perhaps a bit deeper take than Kapp's "Craft of the Japanese Sword".
I have found these books useful for giving a broader, fuller picture of the world these modern smiths work in. I find it helpful and interesting to explore their world from the inside...I find it adds greatly to my appreciation and enjoyment of these swords to have some sort of deeper connection, or understanding, of those who made them. It gives these swords a 3 dimensional aspect that allows me to appreciate them not only as beautiful art but also as photos in a way of the character of their makers.
I remember meeting with Kotani Yasunori and his pals at his home in Kure quite a few years ago now...I was trying to ask him in my poor Japanese about the mental part of sword making...He kept talking about his work schedule, the process, etc., when suddenly his 95 year old Buddhist priest friend banged the table and said, "He wants to know about the sword maker's spirit!" I don't know if he found my line of questioning too personal and was avoiding answering or if my Japanese was just too crude....Perhaps a bit of both because even after his friend made my questioning clear, he didn't really get too deeply into the inner mind of the smith. Then again, these old school smiths considered themselves simple craftsman, not "artists" like some of the later generation and thus perhaps less prone to deeper introspection about something they simply "did" rather than thought too much about.
I wanted to give my rationale for these books but am perhaps drifting off topic....sorry!