Akismet is the single most powerful tool you can use in the prevention of spam on your blog. This is only necessary if you allow discussions on posts (and why wouldn't you want to promote user interaction?). If you do happen to encourage users to converse about a topic, you will definitely want to enable Akismet.
Jack Wallen is an award-winning writer for TechRepublic and Linux.com. He’s an avid promoter of open source and the voice of The Android Expert. For more news about Jack Wallen, visit his website getjackd.net.