If you are new to Japanese swords, these two articles I wrote are handy references (now merged into one). They seem to have been copied frequently throughout the internet either verbatim or loosely paraphrased at this point in time.
Most of my new articles are ending up in my blog now, but these two articles are essential reading for new collectors.
Some general reference stuff:
Educational and commercial links:
Japanese Swords of the Bizen Tradition
Bob Benson and I are collaborating on a series of books, featuring swords owned by North American collectors, with additional articles provided by past or present collectors and experts in our community.
The series will comprise several volumes, the first of which is Japanese Swords of the Bizen Tradition, which is currently available for purchase! Click on the book cover to the right for more information about the book and purchasing it.