It hasn't quite been announced yet, but The Book of PF, 2nd ed (up to date with OpenBSD 4.8) is available now as PDF, with print copies expected to be available around November 10th. As in, at the printers right now.
See http://nostarch.com/pf2.htm for details. It turned into a more extensive rewrite than I had initially anticipated, I hope you will enjoy the result. - Peter -- Peter N. M. Hansteen, member of the first RFC 1149 implementation team http://bsdly.blogspot.com/ http://www.bsdly.net/ http://www.nuug.no/ "Remember to set the evil bit on all malicious network traffic" delilah spamd[29949]: 85.152.224.147: disconnected after 42673 seconds.
