Comment spam is the bane of every blogger's existence. The more popular your blog gets, the more spam you'll be flooded with. Fear not! SixApart has introduced a new spam fighting tool for bloggers called TypePad AntiSpam. Don't let its name fool you-the software is Open Source and available for a variety of blogging platforms,and unlike the software its aiming to compete with, Akismet, it's free. It puts comments in three categories: ham (good), spam or unknown (moderation). Check out more info here.