Comment Log (or clog) is a plugin that allows you to store a copy of a comment you make on another site. 
This is done through implementing the <a href="http://peopletab.com/restta.html" rel="nofollow ugc">RESTTA</a>-based cLog API. 
As long as the remote site supports the API, you can keep track of any comments you make. 
This plugin also allows those that comment on your blog to keep track of their comments. 
The full details about the cLog spec can be found <a href="http://peopletab.com/cLog.html" rel="nofollow ugc">HERE</a>
<h3>Version Log</h3>
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1.2 : Fixed a major bug, it should actually work properly now for the handful of people that use it 😀
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1.1 : Minor updates, you can select the page to display the comment log on from a dropdown now, and confirmed it working with 2.5
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1.0 : Initial version.
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Comment Log

Keep track of your comments on other sites using the cLog API.

wpsimpletools

Completely disables comments functionality from backend and frontend: 
* Hides existing comments 
* Close comments on the front-end 
* Disable support for comments, trackbacks and ping 
* Redirects any user trying to access comments page 
* Removes comments metabox from dashboard 
* Removes comments links from admin bar 
* Removes comments page in menu 
* Completely disables comments API

Disable Comments

The type of plugin I just love... does exactly what it says, no configuration necessary, source readable and understandable in minutes.

Simple, effective, no config ✅

Completely disables comments functionality from backend and frontend. Just install it, nothing to configure!

Comment Log vs Disable Comments