Milan Kaneria

This plugin will insert a link in the comment form that will allow the comment author to delete their personal info from it that is stored in a cookie. Only unregistered commenter will be provided with the delete link if they already had a previously posted comment.
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ET Remove Comment Author Info

This plugin allows commenter to remove their comment author details from the comment form.

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.

ET Remove Comment Author Info vs Comment Author URL Stripper