As mentioned on www.netbsd.org the german publisher C&L has made available a book on NetBSD 1.6. The book covers NetBSD installation (i386, macppc and others), user administration, updating the system, kernel tuning, configuring the rc.d startup system, package management using pkg_install and the pkgsrc tree, configuring the X window system and using NetBSD in a networked environment (IPv4/6, DNS, NFS/NIS, FTP, Samba and the like).