To add to the others see:

McKusick & Neville-Neil. The Design and Implementation of the FreeBSD 
Operating System, 2004. (I haven't looked at it, but I understand it is an 
updated version of the old 4.4BSD book with an additional 100 pages and 
specific to FreeBSD.) 
http://www.unixreview.com/documents/s=9561/ur0408e/ur0408e.html

FreeBSD Architecture Handbook
An online book work in progress.
http://www.freebsd.org/doc/en_US.ISO8859-1/books/arch-handbook/index.html

Another doc in progress is
NetBSD Internals
http://www.netbsd.org/Documentation/internals/en/
(other kernel docs linked from NetBSD doc site too.)

  Jeremy C. Reed

p.s. I have slowly been reading Tanenbaum's old book.
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