pf firewall for a server

[Jonathan Horne]

ive been googling for a while now this evening, but have unsuccesfully found 
any examples on how to firewall a server.  i do *not* want to build a router, 
and unfortunatly, every article i seem to find wants to tell me how to build 
a router!

i just want to learn how to build a simple pf config suitable for a server.  
if anyone knows of a website where such an example might be found, that would 
be awesome (but direct config examples in a reply will also be duely 
appreicated as well :)

thanks,
jonathan