Google Webmaster has a great new feature. Beginner webmasters will appreciate the new Search Appearance pop-up, which can be used to visualize how your site may appear in search and learn more about the content or structure changes that may help to influence each element:

It includes the essential search result elements like title, snippet and URL, as well as optional elements such as sitelinks, breadcrumbs, search within a site, event and product rich snippets, and authorship information.

Read more: Google Webmaster Blog