...I do this all the time. I modify my pf.conf file for Anywhere Technology's main router/firewall, but I always screw something up because I forget the following:
order for pf goes in: options, normalization, queueing, translation, filtering
So, many of you may find this post useless, but it may help me finally remember it without going through the frustration of ...syntax error on line xyz.
Oh, and this diagram kicks ass, too:
http://homepage.mac.com/quension/pf/flow.png