Yes, you've got Mac OS X. Yes, you're protected from Code Red, from Nimda and probably a lot of other Windows NT viruses/worms out there (and yet to come), but even with Mac OS X and Apache, your system bandwidth is clogged by handling each and every one of these illegal messages. An incoming server request makes an illegal request such as: /root.exe ... and your Apache replies with: "I don't know what you're talking about", the infected host doesn't go away, but returns again and again and again. Your uninfected server is bogged down rejecting bogus messages from infected systems. Your bandwidth usage goes up, and if you're on a plan that charges more after a certain usage, your costs go up, too. Little Dutch Moose plugs those holes. Figuring that the infected system is no friend of yours, when Little Dutch Moose finds a site that is attempting to contract your server with a worm-like or virus-like command, Little Dutch Moose immediately issues an order to your built-in firewall to automatically shut the door on that host. These sites go away for good. Your Web server should spin its cycles dealing with requests that it wants to deal with.
Little Dutch Moose can also protect you from the unthinkable - an Apache worm... As soon as the distinguishing signature of an Apache worm is known, Little Dutch Moose can be on the lookout for that, too!