From The Google Blog

• Using schema.org markup for organization logos
  Webmaster level: all Today, we’re launching support for the schema.org markup for organization logos, a way to connect your site with an iconic image. We want you to be able to specify which image we use as your logo in Google search results. Using schema.org Organization markup, you can indicate to our algorithms the location of your preferred logo. For exa […]
• Introducing "x-default hreflang" for international landing pages
  Webmaster Level: All The homepages of multinational and multilingual websites are sometimes configured to point visitors to localized pages, either via redirects or by changing the content to reflect the user’s language. Today we’ll introduce a new rel-alternate-hreflang annotation that the webmaster can use to specify such homepages that is supported by bot […]
• 5 common mistakes with rel=canonical
  Webmaster Level: Intermediate to Advanced Including a rel=canonical link in your webpage is a strong hint to search engines your preferred version to index among duplicate pages on the web. It’s supported by several search engines, including Yahoo!, Bing, and Google. The rel=canonical link consolidates indexing properties from the duplicates, like their inbo […]