aaron44126

This simple plugin disables the automatic parsing of links in comments on your 
blog. Ordinarily, if a user types something like http://www.google.com/, it 
will automatically be turned into a clickable link when it is displayed. This 
plugin disables this behavior for http, ftp, and e-mail links.
Note that comments can include the HTML tags necessary to create links, if you 
allow HTML in comments, and these links will not be removed. This also allows 
you as the administrator to get around the “no comments in links” rule enforced 
by this plugin, since administrators (and editors) by default can post comments 
with unfiltered HTML.

No Comment Links

When activated, disables automatic parsing and creation of clickable links in comments, including http, ftp, and e-mail links.

Nick Momrik

When writing comments, a lot of people type in google.com, yahoo.com, hotmail.com, and various other web sites which don’t belong to them. This plugin strips out the comment author URL whenever it contains anything from a set of words that you specify in the Options screen. The URL will never make it to the database.

Comment Author URL Stripper

Removes the comment author URL if it contains any of the specified words.

No Comment Links vs Comment Author URL Stripper