A paper by Ignatios Souvatzis entitled "The New Link-Level Independent ARP Subsystem of NetBSD" about kernel internals; how the NetBSD ARP subsystem has been changed to differ from traditional 4.4BSD; and how to change your ethernet driver to co http://ezine.daemonnews.org/199809/underhood.html
Anders Dinsen's personal NetBSD page. Contains details on his port of NetBSD to Eicon MIPS based machines, and a NetBSD kernel documentation overview. http://dinsen.net/netbsd/
A project whose aim is to update the printing subsystem for the NetBSD operating system to use the ppbus system developed on FreeBSD, another open source BSD system. http://netbsd-ppbus.sourceforge.net/