Here’s a little one-trick pony WordPress plugin. Delink Comment Author adds a link that will remove the URL that the commenter left with their comment to the bottom of your comment notification e-mails and the comments list in your WP admin page.
My comment policy is to allow only personal web site URLs from commenters. From time to time someone will leave a pretty legit comment, but with a pretty non-personal URL. With this plugin I can just remove the URL instead of deleting the entire comment. Not sure how useful this will be to others, but it’s I’ve put it out there if you want to use it.
The download and more information are available on my WordPress Plugins page.
If you have any trouble with this, please open a thread in the WP Support Forums and send me the link.