undeadly mentioned a couple of days ago that Michael Lucas recently made an hour talk on OpenBSD to the Michigan Users' Group:
http://undeadly.org/cgi?action=artic...20131115084549
It's also available on YouTube:
http://www.youtube.com/watch?v=BXPV3vJF99k
At the end, Michael mentions a new book on
sudo(8) mastery which I found on Amazon:
http://www.amazon.com/Sudo-Mastery-A...=ATVPDKIKX0DER
Enjoy!