Why OpenBSD is a Better Platform
Kyle Amon,  Page 1 
most secure unix flavor, free or commercial, "out of the box"

installs with unnecessary network services disabled

excellent cryptography has been liberally applied

Kerberos 4 and 5

OpenSSH

full IPSec support before ANY other OS

full IPv6 support

security focused ports tree

randomized process IDs and superior TCP ISN generation

encrypted swap space and filesystems