Under the Hood - 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
UBC: An Efficient Unified I/O and Memory Caching Subsystem for NetBSD - A paper by Chuck Silvers about the design and implementation of the Unified Buffer Cache (UBC) in NetBSD. [Freenix] - http://www.usenix.org/publications/library/proceedings/usenix2000/freenix/full_papers/silvers/silvers_html/
Scheduler Activations on NetBSD - Paper by Nathan Williams regarding the implementation of scheduler activations on NetBSD. [Freenix] - http://web.mit.edu/nathanw/www/usenix/
NetBSD and Handheld Platforms - A paper describing the technical challenges in porting NetBSD to a handheld devices, as well as reasons one would wish to install it on one. [EuroBSDCon] - http://2004.eurobsdcon.org/uploads/media/EBSD04_37.pdf
Verified Executables for NetBSD - Paper by Brett Lymn describing his implementation of a "kernel-level tripwire" for NetBSD. - http://www.users.on.net/~blymn/veriexec/
Some NetBSD resources - 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/
NetBSD Ppbus Project - 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/