We already know how 404 errors ruin your SEO and usability. And long ago I shared some ways to keep track of 404 pages that may occur on the site. Today I am adding two tools to your arsenal: for those who use Wordpress to run their sites. So here you go: two Wordpress plugin that alert you once your blog visitor lands on an error page : 404 Notifier This plugin sends email alerts once the visitor of your blog comes across a 404 page. After you install it,