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zem_prblock is a Textpattern plugin that reduces the incentive for comment spam by blocking PageRank on outgoing links. It also allows attributes such as class and target to be selectively applied to links to external web sites.
Comment spam is usually motivated by web site owners trying to improve their ranking in Google search results. They do this by including links to their web site in comments submitted to many different blogs. Google interprets these links as meaning that the spammer’s web site is very popular.
Download and documentation: link.
This was initially a software ransom, but it’s already paid in full, so it’s available for download now.
I’m sure it works great (like all your plugins do), but – if someone prefers hacks –
rel="nofollow" can be easy added to the visitor’s url by changing line 102 in publish/comment.php file to
$name = '<a href="http://'.$web.'" title="'.$web.'" rel="nofollow">'.$name.'</a>';