I am glad to announce you that there have been a huge update for Vibe SEO Pack plugin! Major change is that Vibe SEO Pack becomes the first free WordPress SEO plugin that runs a SEO audit for each one of your posts or pages and suggest you what should be improved for a better ranking.
Using the plugin you will be able to interact with other bloggers or twitter users that are sharing the same interest as you about your post main topic, so i would call Vibe SEO Pack the WordPress SEO 2.0 plugin. :))
Check it out and suggest new features trough "get satisfied" button.
License is of course GPL. ;-)