>Tried putting a nofollow link to some site in the template
>of your blogs/forums or footer of your html pages?
>
>Many of the comment spammers look for "dofollow" links by
>checking a page to see if it contains "nofollow". I'm
>thinking if a page has a nofollow link somewhere on the
>page, many of the comment spammers will think the page
>comments are nofollow....I'm pretty sure most spammers don't
>check every link, but rather just search a page for
>"nofollow".

If that's the way comment spamming software works seems like it's a very valid idea. Would this work for links in the sidebar to high authority sites? Worth a try.

However, the theme on the sites I was just thinking of adding that on is built to not allow comments. I'll try it on the next batch of sites I build/buy with a different theme. But that could be awhile. Things are going very slow.