Spam Comments
Unfortunately, spammer are relentless and savvy. They are constantly changing their methods and trying new ways to penetrate and/or take advantage of all the hard work you've done. Therefore, this is usually not a one time fix all sort of deal. It's rather a proactive effort. Wordpress does a pretty good job of isolating spam comments when the arise.
In conjunction with the built in functions provide from Wordpress to quell spammers, we have created a blacklist as new spammers show up. Most of the time, it's the same IP's that will spit out spam over and over and over again. When we block those IP it doesn't matter what they send the messages will automatically be put in the trash. Will create an internal function to do this on a regular basis to keep them at bay.