Do you worry about ssh brute force attacks on your servers?
axod: You can use iptables to rate limit connections:  -N SSH_RECENT
  -A INPUT -m state --state NEW -p tcp --dport 22 -j SSH_RECENT
  -A SSH_RECENT -m recent --set --name SSH
  -A SSH_RECENT -m recent --update --seconds 60 --hitcount 3 --name SSH -j DROP