Thanks to Google, MSN, and Yahoo, there’s a new tool to fight comment and referer spam: the no follow tag.
MovableType already has a plugin that works simply by dropping it in place.
To celebrate I have uncommented the comment link, and open comments for this posting. I realize that spam will continue for a time, but with the major search engines no longer cataloging it from inside comments (or on referer pages) most of the incentive will be gone.