I am seeing an awful lot of these lines in my error log, and I'm not sure what it means: it looks at first glance like someone is using the comments script to request their pages (the pages in question from what I can tell are run of the mill spam sites -- some pharmaceutical products are mentioned).
[Sat Aug 09 08:34:21 2008] [error] [client 193.34.144.83] Successfully fetched 'http://rocknrollfantasy.hi-blog.com/': GET response code 206, referer: http://mydomain.home/wordpress/wp-comments-post.php
So two questions: is that an accurate assessment and how can I block it? I've added some lines to .htaccess as I find them but that's just a war of attrition/arms race approach.