Google Webmaster Tools added two new features: fetch as Googlebot that shows how Googlebot sees a page, and malware details to show malware code in infected websites. The two features are in the new Labs tab of Google Webmaster Tools.
Google presents the new features in the article Fetch as Googlebot and malware details of the Official Google Webmaster Central Blog, and the malware details feature is discussed in detail in the article Show me the malware of the Google Online Security Blog.