Think twice before deleting your OpenID source
This person describes how by deleting their old blog on wordpress.com they deleted their OpenID too. This meant that they were then locked-out of other sites that they had authenticated using their wordpress.com username.
The lesson here is think twice before deleting an account that you have used to authenticate others with via OpenID. Also add multiple ID’s to an account if you can.
One important thing that you need to realize is that once you deleted a blog URL in WordPress.com, you will never get it back and a page saying that the blog has been deleted will be displayed. I deleted my WordPress.com blog to prevent it from becoming an eyesore, and to avoid redundancy. Little did I know that my OpenID vanishes along with the blog.
via Be Careful With OpenID | Romantika.name.