Google announced back in November of 2006 that they would be making efforts to protect users by identifying dangerous sites (those containing malware for example) through notifications in their Webmaster Tools section. According to the official Google Webmaster Central Blog, they are now including more detailed information and notifying sites of issues via email.

Google now not only flags suspect sites but now shows example URLs that have been determined to be dangerous - very helpful since malicious content can often be hard to find. According to the official announcement "By providing example URLs, webmasters are one step closer to diagnosing the problem and ultimately re-securing their sites."  Kudos to Google for their continued support of both end-users and the webmaster community.