The newest version of this mini-HOWTO can be found at my homepage in several formats (including SGML and PostScript.) The document has been translated into Japanese by Mr. Teruyoshi Fujiwara as part of the JF project.
The FreeBSD Handbook and The FreeBSD FAQ are distributed with FreeBSD. They can also be found at FreeBSD Inc.. This site has a lot of other information about FreeBSD too.
The Linux Kernel HOWTO is released as part of The Linux Documentation Project.