In reply to Alec Kinnear.

Unlike all of the plugins mentioned in this post, Thoughtful Comments is the only one that has the ability to ban people. I like this feature although I'd like something not so strict. Something more inbetween like a timeout feature where I can set a default limit to put people in timeout and when they leave a comment, the plugin tells them that because of a previous comment's content, they've been put in time out.