Rich Snippets in search results help improve your click through rate to your website. Support structured data types: Product, Breadcrumbs, Google Authorship.
With many year experience work on magento. We are building extension Seo Plus for magento with features: Sitemap, SiteMap XML, Rewrite Url, Link Exchange, Robots Meta Header, robots.txt, .htaccess, etc... With our extension you can easy SEO for your site. It have all feature which you need.