HeadSpace2 allows you to add meta-data to your posts, pages, search results, archives, and categories. Meta data is added via a GUI, or can be automatically extracted from post content. Also allows modification to page titles, blog name, and per-post themes.
HeadSpace allows you to configure settings for specific posts, pages, and category pages. In addition to this you can configure settings globally, as well as for search results, 404 errors, author pages, the home page, and archive pages. Settings for specific posts and categories will always take precedence over general settings, and HeadSpace will merge any settings together so you can spend as little time as possible configuring your site.