I've just got a copy of the recently published BSD Hacks book, by Dru Lavigne. Back in February, I wrote two little hacks (specially addressed to the book), titled "Log a headless server remotely" and "Automate NetBSD package builds", that were added to it. Wow, I'm really happy to see the printed results :-)
After I've read it entirely, I'll post another message with my impressions. Just to say that it looks promising.