Hi there! I’ve just released SeeYouLater 1.2 (fetch a list of IP or known spammers and to ban them by putting them in /etc/hosts.deny). It now includes seeyoulater-httpsharer, that enables to share ban list over http instead of authenticated MySQL. It’s useful for distant hosts with unreliable link to each other/to avoid having MySQL listening on public ports.
You can obtain it on the Gna! project page using SVN or debian packages.