Extends WordPress SEO by Yoast to add SEO info to the post & page listing screen. It is unnecessary if you are running WordPress SEO v1.2+
If you're not already using version 1.2 or greater then I would strongly suggest upgrading.
If for some reason you are unable to upgrade WordPress SEO to version 1.2 then you might find this plugin a useful addition. It adds extra columns to the Page and Post listing screens in the WordPress admin area, which display the SEO Title and Meta Descripton fields set via Yoast's plugin.