Rhys Wynne

This plugin quite simply lets you know where the users entered your site when they leave a comment. A lot of people who joined the do-follow movement are listed on sites which are a target for comment spammers. To those who suffer comment spam can now find out the page they come from, and block accordingly.
This plugin uses a cookie to track the commenter, so if the user hits the first page first, they will still be tracked.

InComment

Adds an extra "referral" note to the bottom of comment forms, so you could see where people come from comment. Useful for finding resources  …

NFCBC SEO Light – The light version of <a href="http://www.fob-marketing.de/marketing-seo-blog/wordpress-nofollow-seo-plugin-nofollow-case-by-case.html" title="Nofollow Case by Case" rel="nofollow ugc">Nofollow Case by Case</a>?
You might have heard rumours about pagerank sculpting (old school -> new school). 
You might have heard about follow and nofollow links. 
You might not love the idea of blocking every single comment link. 
You might not love the idea of moderating every single comment link.
How about voting with good links for great comments only?
Supported options of NFCBC SEO Light:
<ul>
<li>No link for very small comments (default: 50 characters). </li>
<li>Nofollow link for small comments (default: 170 characters). </li>
<li>Follow links for large comments, pings and trackback links. </li>
</ul>
Default values can be replaced for every single link.
Author link exeptions can be made like this:
Add /dontfollow to the author link to get a nofollow link. 
Add /thisfollow to get a follow link. 
Add /nolink to show the author name without a link.
<h3>more info</h3>
Please visit [fob marketing](http://www.fob-marketing.de/marketing-seo-blog/ fob marketing) 
for more information.
This program is distributed in the hope that it will be useful, but 
WITHOUT ANY WARRANTY; without even the implied warranty of 
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

NFCBC SEO Light

NFCBC SEO Light - The light version of [Nofollow Case by Case](http://www.fob-marketing.de/marketing-seo-blog/wordpress-nofollow-seo-plugin-nofollow-c …

InComment vs NFCBC SEO Light