Another precaution that I added to my WordPress installation is Auto-Close Comments. This is a Plugin that closes comments to posts that are older then xx number of days, leaving comment spammers with less posts to try to spam.
Update: Removed plugin as it caused too many Headers already sent errors. I was able to overcome all of them but the RSS feeds.
Another update: Found the problem. There is an extra space at the end of the plugin code. It may of gotten there by my copy and pasting the code to my text editor. I reinstalled the plugin and don’t see the previous errors.