Unique Title Checker for WordPress
Those of you who know your SEO know the importance of using unique titles and content on each page to improve your chances of getting ranked higher. Even with the best memory in the world, you may not remember all the titles you have used in the past. The Unique Title Checker for WordPress can help.
This simple plugin lets you know when the title you have come up with is not unique. It can take into account posts, pages, and post types. You can download it for free.