We have just started working on a new edition of the 4.4BSD book to be called ``The Design and Implementation of the FreeBSD Operating System''. It will be based on the 5.X version of FreeBSD. It is to be published by Addison-Wesley and we hope to have it out in mid to late 2004.
I am really excited by this development. Several cool FreeBSD books have been published recently, like Absolute BSD and the The Embedded FreeBSD Cookbook. I can't wait to read the new McKusick book -- maybe by next year I'll be ready for it!